cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 10 results.

A207559 Number of n X 3 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

6, 36, 92, 221, 618, 1690, 4861, 13900, 40452, 117717, 345002, 1012682, 2983173, 8803252, 26036140, 77123437, 228815946, 679742490, 2021736365, 6019369820, 17938267476, 53500929061, 159681492682, 476893979146, 1425053001333
Offset: 1

Views

Author

R. H. Hardin, Feb 18 2012

Keywords

Comments

Column 3 of A207564.

Examples

			Some solutions for n=4:
..0..0..0....1..0..0....0..1..1....1..1..1....1..1..0....0..1..1....0..0..0
..1..1..0....0..0..0....1..0..0....1..1..0....0..0..0....1..1..1....1..1..1
..0..0..0....1..0..1....0..0..0....1..1..0....1..0..1....0..1..1....0..0..0
..0..1..1....0..0..0....0..1..1....1..1..0....0..0..0....1..1..1....0..0..0
		

Crossrefs

Cf. A207564.

Formula

Empirical: a(n) = 6*a(n-1) - 6*a(n-2) - 21*a(n-3) + 36*a(n-4) + 12*a(n-5) - 39*a(n-6) + 6*a(n-7) + 10*a(n-8) - 3*a(n-9) for n>10.
Empirical g.f.: x*(6 - 88*x^2 + 11*x^3 + 384*x^4 - 128*x^5 - 440*x^6 + 160*x^7 + 120*x^8 - 45*x^9) / ((1 - x)*(1 + x)*(1 - 3*x)*(1 - 3*x + x^2)*(1 + x - x^2)*(1 - x - x^2)). - Colin Barker, Mar 05 2018

A207558 Number of n X n 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

2, 16, 92, 636, 9568, 138017, 3275898, 100565794, 5427850334, 274972547840, 35540211201327, 3458816367555240, 1051654956960360726, 183797069898348851705, 149794018569432287405504
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Diagonal of A207564

Examples

			Some solutions for n=4
..0..0..0..0....1..0..1..1....1..1..0..1....1..0..0..0....1..1..0..1
..1..0..1..1....1..1..1..1....1..1..0..1....0..1..1..0....0..0..0..0
..0..0..0..0....1..0..1..1....1..1..1..1....1..0..0..0....0..1..1..1
..0..1..1..0....1..1..1..1....1..1..0..1....0..0..0..0....1..0..0..0
		

A207560 Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

9, 81, 241, 636, 2135, 6709, 23276, 78733, 277781, 973608, 3477827, 12422849, 44780404, 161681185, 586480585, 2130883040, 7761845079, 28308582237, 103395253764, 377977638085, 1382951559309, 5062965194920, 18545296800603
Offset: 1

Views

Author

R. H. Hardin, Feb 18 2012

Keywords

Comments

Column 4 of A207564.

Examples

			Some solutions for n=4:
..1..1..0..1....1..1..0..1....1..0..0..0....1..1..1..0....0..0..0..0
..1..1..0..1....1..0..1..1....0..1..1..0....0..1..1..0....1..0..1..1
..1..1..1..1....1..1..0..1....1..0..0..0....0..1..1..0....0..0..0..0
..1..1..0..1....1..0..1..1....0..1..1..1....1..1..1..0....0..1..1..0
		

Formula

Empirical: a(n) = 7*a(n-1) -2*a(n-2) -73*a(n-3) +95*a(n-4) +258*a(n-5) -429*a(n-6) -357*a(n-7) +730*a(n-8) +125*a(n-9) -499*a(n-10) +70*a(n-11) +106*a(n-12) -30*a(n-13) for n>14.

A207561 Number of nX5 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

14, 196, 720, 2234, 9568, 36426, 160652, 666212, 2958300, 12763810, 56890052, 250429286, 1120029716, 4985081444, 22367733696, 100216967838, 450974257968, 2029310442178, 9154744404876, 41320179008364, 186800175680348
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Column 5 of A207564

Examples

			Some solutions for n=4
..1..1..1..1..0....1..0..0..0..0....1..0..1..1..1....1..0..1..1..1
..1..1..1..1..1....0..1..1..1..1....1..0..1..1..0....1..1..0..0..0
..1..1..1..1..0....0..0..0..0..0....1..1..1..1..1....1..0..1..1..0
..1..1..1..1..1....0..1..1..1..1....1..0..1..1..0....1..1..0..0..0
		

Formula

Empirical: a(n) = 12*a(n-1) -18*a(n-2) -286*a(n-3) +990*a(n-4) +2420*a(n-5) -13219*a(n-6) -7318*a(n-7) +87016*a(n-8) -13474*a(n-9) -326656*a(n-10) +164320*a(n-11) +729389*a(n-12) -512204*a(n-13) -962042*a(n-14) +804466*a(n-15) +713562*a(n-16) -680852*a(n-17) -265049*a(n-18) +296838*a(n-19) +35044*a(n-20) -56802*a(n-21) +984*a(n-22) +2880*a(n-23) for n>24

A207562 Number of nX6 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

21, 441, 1889, 6315, 32823, 138017, 738515, 3451393, 18459985, 91330863, 487900273, 2497699401, 13360428739, 69888755449, 374927533581, 1989044972519, 10707046454737, 57336073886865, 309657266929019, 1668728092514473
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Column 6 of A207564

Examples

			Some solutions for n=4
..1..1..1..0..1..1....1..1..1..1..0..1....1..1..1..1..1..1....1..0..1..1..1..0
..1..1..0..0..0..0....0..1..1..1..1..1....1..1..1..1..0..1....0..0..0..0..0..0
..1..1..1..1..0..1....1..1..1..1..0..1....1..1..1..1..1..1....0..1..1..0..1..1
..1..1..0..0..0..0....0..1..1..1..1..1....1..1..1..1..0..1....1..0..0..0..0..0
		

Formula

Empirical: a(n) = 13*a(n-1) +21*a(n-2) -869*a(n-3) +1167*a(n-4) +25921*a(n-5) -61027*a(n-6) -461409*a(n-7) +1307303*a(n-8) +5518049*a(n-9) -16754393*a(n-10) -47155119*a(n-11) +143303719*a(n-12) +297553021*a(n-13) -858496963*a(n-14) -1406286693*a(n-15) +3688250489*a(n-16) +4984465847*a(n-17) -11481185897*a(n-18) -13149704547*a(n-19) +25930908661*a(n-20) +25469152675*a(n-21) -42215807347*a(n-22) -35539635477*a(n-23) +48785432574*a(n-24) +34851279298*a(n-25) -38943699158*a(n-26) -23230133746*a(n-27) +20520793444*a(n-28) +10043976396*a(n-29) -6608615256*a(n-30) -2624540040*a(n-31) +1127367144*a(n-32) +366164280*a(n-33) -72744480*a(n-34) -20217600*a(n-35) for n>36

A207563 Number of nX7 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

31, 961, 4719, 16812, 106833, 493471, 3275898, 17232331, 114004725, 647020166, 4243514607, 25257749917, 164582667340, 1010000577881, 6556696152743, 41041784984580, 265986401901157, 1686689372009279, 10927292093193426
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Column 7 of A207564

Examples

			Some solutions for n=4
..0..0..0..0..0..0..0....1..1..1..1..1..1..1....0..1..1..0..1..1..0
..1..1..1..1..0..0..0....0..0..0..0..0..0..0....1..1..1..0..0..0..0
..0..0..0..0..0..0..0....1..0..0..0..0..0..0....0..1..1..0..0..0..0
..1..0..1..1..1..1..0....0..1..1..1..0..0..0....1..1..1..0..0..0..0
		

Formula

Empirical: a(n) = 15*a(n-1) +77*a(n-2) -2046*a(n-3) -429*a(n-4) +128837*a(n-5) -179947*a(n-6) -5002742*a(n-7) +10715924*a(n-8) +134822996*a(n-9) -338437234*a(n-10) -2687118622*a(n-11) +7153313284*a(n-12) +41146741810*a(n-13) -109928061876*a(n-14) -495743990582*a(n-15) +1281266267798*a(n-16) +4769695136712*a(n-17) -11615524444272*a(n-18) -36971607384056*a(n-19) +83242108862650*a(n-20) +231971832217622*a(n-21) -476657723689140*a(n-22) -1180217986743574*a(n-23) +2196013630719333*a(n-24) +4866835465582423*a(n-25) -8172102704389697*a(n-26) -16227516943169348*a(n-27) +24594308969516143*a(n-28) +43563976143481107*a(n-29) -59768169359482685*a(n-30) -93570219609964538*a(n-31) +116743033427890578*a(n-32) +159413368148539118*a(n-33) -181770451410051698*a(n-34) -212969039687871148*a(n-35) +222750020950558944*a(n-36) +219831253212876016*a(n-37) -210942550899039672*a(n-38) -172065591066644864*a(n-39) +150479223605638368*a(n-40) +99752372852080576*a(n-41) -78048773506516656*a(n-42) -41589102799746720*a(n-43) +27987000640420608*a(n-44) +11997001677156768*a(n-45) -6427472710615200*a(n-46) -2258184690293760*a(n-47) +827419962124800*a(n-48) +247397856768000*a(n-49) -43647621120000*a(n-50) -11645337600000*a(n-51) for n>52

A207565 Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

9, 81, 221, 636, 2234, 6315, 16812, 47596, 129150, 337186, 892181, 2343529, 6046508, 15601217, 40205083, 102833093, 262404045, 669166152, 1701139222, 4316129307, 10943611348, 27709283328, 70072708774, 177098593806, 447280003769
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Row 4 of A207564

Examples

			Some solutions for n=4
..0..0..0..0....1..0..1..1....1..1..0..1....1..0..0..0....0..0..0..0
..1..0..1..1....0..0..0..0....1..0..1..1....0..1..1..0....1..0..0..0
..0..0..0..0....1..0..1..1....1..1..0..1....1..0..0..0....0..1..1..0
..0..1..1..0....0..0..0..0....1..0..1..1....0..0..0..0....1..0..0..0
		

Formula

Empirical: a(n) = 4*a(n-1) -4*a(n-2) +10*a(n-3) -30*a(n-4) +10*a(n-5) -4*a(n-6) +54*a(n-7) +10*a(n-8) -22*a(n-9) -62*a(n-10) -10*a(n-11) +18*a(n-12) +32*a(n-13) +7*a(n-14) -6*a(n-15) -6*a(n-16)

A207566 Number of 5Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

14, 196, 618, 2135, 9568, 32823, 106833, 378104, 1270366, 4115246, 13610961, 44612720, 143811649, 464834887, 1499835880, 4806097790, 15381806724, 49183889079, 156799893608, 499134276207, 1587530091239, 5041841569010
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Row 5 of A207564

Examples

			Some solutions for n=4
..1..0..1..1....1..0..1..1....0..1..1..0....0..0..0..0....1..1..0..0
..1..1..1..1....0..1..1..0....0..0..0..0....1..0..0..0....1..1..1..0
..1..0..1..1....1..0..1..1....0..0..0..0....0..1..1..0....1..1..0..1
..1..1..1..1....0..1..1..0....0..0..0..0....0..0..0..0....1..1..1..0
..1..0..1..1....1..0..1..1....1..1..0..0....1..0..1..1....1..1..0..1
		

Formula

Empirical: a(n) = 5*a(n-1) -6*a(n-2) +22*a(n-3) -85*a(n-4) +35*a(n-5) -76*a(n-6) +424*a(n-7) +187*a(n-8) -47*a(n-9) -1134*a(n-10) -824*a(n-11) +5*a(n-12) +1715*a(n-13) +1238*a(n-14) +142*a(n-15) -1061*a(n-16) -707*a(n-17) -174*a(n-18) +280*a(n-19) +89*a(n-20) -13*a(n-21) -46*a(n-22) +10*a(n-23) +11*a(n-24) +11*a(n-25)

A207567 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

22, 484, 1690, 6709, 36426, 138017, 493471, 1980774, 7259428, 25276248, 91512891, 323438636, 1108858657, 3843873169, 13238517646, 44841691184, 152090405602, 514775385341, 1726736775278, 5782478579121, 19341544402175, 64371828667182
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Row 6 of A207564

Examples

			Some solutions for n=4
..1..1..0..0....1..0..1..1....0..1..1..1....1..0..0..0....0..1..1..1
..1..1..1..1....1..0..0..0....0..1..1..0....0..0..0..0....1..0..1..1
..1..1..0..0....1..1..0..0....0..1..1..1....1..1..1..1....0..1..1..1
..1..1..0..0....1..0..1..1....0..1..1..0....0..0..0..0....1..0..1..1
..1..1..0..0....1..1..0..0....0..1..1..1....1..1..1..1....0..1..1..1
..1..1..1..0....1..0..0..0....0..1..1..0....0..0..0..0....1..0..1..1
		

Formula

Empirical: a(n) = 5*a(n-1) -6*a(n-2) +30*a(n-3) -117*a(n-4) +51*a(n-5) -132*a(n-6) +648*a(n-7) +291*a(n-8) -63*a(n-9) -1806*a(n-10) -1320*a(n-11) +45*a(n-12) +2859*a(n-13) +2046*a(n-14) +198*a(n-15) -1821*a(n-16) -1203*a(n-17) -294*a(n-18) +480*a(n-19) +153*a(n-20) -21*a(n-21) -78*a(n-22) +18*a(n-23) +19*a(n-24) +19*a(n-25)

A207568 Number of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Original entry on oeis.org

35, 1225, 4861, 23276, 160652, 738515, 3275898, 16648464, 77299468, 346860730, 1628437829, 7520074031, 34197531024, 157677790883, 726171154807, 3326887874211, 15303816884989, 70464546420156, 323991903658548
Offset: 1

Views

Author

R. H. Hardin Feb 18 2012

Keywords

Comments

Row 7 of A207564

Examples

			Some solutions for n=4
..0..1..1..1....0..1..1..1....1..0..0..0....1..0..1..1....0..0..0..0
..1..1..0..0....0..0..0..0....0..0..0..0....1..0..0..0....0..0..0..0
..0..1..1..1....1..0..0..0....1..0..1..1....1..0..1..1....0..1..1..0
..1..1..0..0....0..0..0..0....0..0..0..0....1..1..0..0....1..0..0..0
..0..1..1..0....1..1..1..0....1..0..1..1....1..0..0..0....0..0..0..0
..1..1..0..0....0..0..0..0....0..0..0..0....1..1..0..0....0..0..0..0
..0..1..1..0....0..1..1..0....1..0..1..1....1..0..1..1....1..1..1..1
		

Formula

Empirical: a(n) = 7*a(n-1) -12*a(n-2) +66*a(n-3) -355*a(n-4) +267*a(n-5) -845*a(n-6) +5223*a(n-7) +2042*a(n-8) -38*a(n-9) -35986*a(n-10) -32364*a(n-11) +462*a(n-12) +151576*a(n-13) +113718*a(n-14) -7212*a(n-15) -265050*a(n-16) -171750*a(n-17) +35538*a(n-18) +249492*a(n-19) +31110*a(n-20) -88254*a(n-21) -112194*a(n-22) +56598*a(n-23) +69082*a(n-24) +41276*a(n-25) -31470*a(n-26) -11664*a(n-27) -1085*a(n-28) +5229*a(n-29) -2218*a(n-30) -420*a(n-31) -959*a(n-32) +257*a(n-33) -65*a(n-34) -33*a(n-35) +32*a(n-37)
Showing 1-10 of 10 results.