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 1-6 of 6 results.

A196952 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

3, 9, 26, 87, 282, 919, 2987, 9722, 31643, 102962, 335048, 1090310, 3548040, 11545789, 37571671, 122263766, 397863990, 1294706917, 4213164246, 13710247872, 44615134395, 145184117131, 472450174347, 1537421386475, 5002992156783
Offset: 1

Views

Author

R. H. Hardin, Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's.
Column 3 of A196957.

Examples

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

Crossrefs

Cf. A196957.

Formula

Empirical: a(n) = a(n-1) +4*a(n-2) +8*a(n-3) +10*a(n-4) +a(n-5) -9*a(n-6) -6*a(n-7) +a(n-9) for n>10.
Empirical g.f.: x*(3 + 6*x + 5*x^2 + x^3 - 11*x^4 - 12*x^5 + 2*x^6 + 6*x^7 + 2*x^8 - x^9) / (1 - x - 4*x^2 - 8*x^3 - 10*x^4 - x^5 + 9*x^6 + 6*x^7 - x^9). - Colin Barker, May 10 2018

A196953 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

4, 20, 87, 492, 2687, 14509, 78717, 427700, 2320738, 12593583, 68356288, 370995901, 2013496775, 10928042781, 59310677884, 321900611044, 1747074166413, 9482023129916, 51462457739671, 279305865035645, 1515896714830837
Offset: 1

Views

Author

R. H. Hardin Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's
Column 4 of A196957

Examples

			Some solutions for n=5
..0..0..0..0....0..0..1..1....0..0..1..1....0..0..0..0....0..0..1..1
..0..0..0..0....0..1..0..0....1..0..0..0....1..0..0..0....0..0..0..0
..0..4..0..0....0..1..0..0....1..0..1..1....1..0..4..0....0..4..0..0
..0..0..1..0....0..0..0..1....0..0..0..0....0..0..0..1....0..0..0..0
..0..0..1..0....0..0..0..1....0..0..1..1....0..0..0..1....1..1..0..0
		

Formula

Empirical: a(n) = 2*a(n-1) +10*a(n-2) +37*a(n-3) +54*a(n-4) -39*a(n-6) -10*a(n-7) -37*a(n-8) -49*a(n-9) -18*a(n-10) -9*a(n-11) -16*a(n-12) +6*a(n-13) -a(n-14) +a(n-15) for n>16

A196954 Number of n X 5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

6, 41, 282, 2687, 23956, 214124, 1918608, 17197531, 154075730, 1380294235, 12367225355, 110805484184, 992753872004, 8894587877534, 79691287683196, 713994702986579, 6397041470072060, 57314366530825786, 513508682261967861
Offset: 1

Views

Author

R. H. Hardin, Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's.
Column 5 of A196957.

Examples

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

Crossrefs

Cf. A196957.

Formula

Empirical: a(n) = 3*a(n-1) +30*a(n-2) +172*a(n-3) +401*a(n-4) -187*a(n-5) -3185*a(n-6) -3461*a(n-7) +7148*a(n-8) +9487*a(n-9) -10397*a(n-10) -9254*a(n-11) +6040*a(n-12) +16653*a(n-13) +10403*a(n-14) -6166*a(n-15) -32205*a(n-16) +88763*a(n-17) -92837*a(n-18) +107224*a(n-19) -129392*a(n-20) +84460*a(n-21) -49775*a(n-22) +24488*a(n-23) -13127*a(n-24) +3256*a(n-25) +696*a(n-26) +1437*a(n-27) -1138*a(n-28) +549*a(n-29) -209*a(n-30) +72*a(n-31) -129*a(n-32) +54*a(n-33) -6*a(n-34) +4*a(n-35) -a(n-36) for n>37.

A196955 Number of nX6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

9, 85, 919, 14509, 214124, 3166711, 46887039, 695103098, 10297360567, 152533682507, 2259873131532, 33480136150093, 495998442533320, 7348153813176990, 108862184131945286, 1612778456172743874
Offset: 1

Views

Author

R. H. Hardin Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's
Column 6 of A196957

Examples

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

Formula

Empirical: a(n) = 7*a(n-1) +77*a(n-2) +551*a(n-3) +1272*a(n-4) -10891*a(n-5) -49532*a(n-6) +93116*a(n-7) +424295*a(n-8) -619843*a(n-9) -1352928*a(n-10) +2802763*a(n-11) -346998*a(n-12) -1217449*a(n-13) +7614081*a(n-14) -28825217*a(n-15) +49172862*a(n-16) +40960319*a(n-17) -457973584*a(n-18) +1894201513*a(n-19) -5513473439*a(n-20) +12149644000*a(n-21) -23417346222*a(n-22) +36628940829*a(n-23) -49297628055*a(n-24) +56863507040*a(n-25) -55445335419*a(n-26) +51532510376*a(n-27) -46421420235*a(n-28) +35120732043*a(n-29) -27034867980*a(n-30) +18696682781*a(n-31) -8440183720*a(n-32) +997167933*a(n-33) +7029467038*a(n-34) +415168814*a(n-35) -5281022967*a(n-36) -4237853757*a(n-37) +6715710917*a(n-38) +2942862571*a(n-39) -2033444082*a(n-40) -2435466101*a(n-41) -344618803*a(n-42) +1326619326*a(n-43) +518217357*a(n-44) -692159694*a(n-45) -528109786*a(n-46) +117781061*a(n-47) +210250015*a(n-48) +96403521*a(n-49) +8664594*a(n-50) -29304220*a(n-51) -19140223*a(n-52) -3291127*a(n-53) +6981752*a(n-54) +789035*a(n-55) -1350824*a(n-56) -631946*a(n-57) -6104*a(n-58) +214279*a(n-59) +47292*a(n-60) -7839*a(n-61) -10523*a(n-62) -528*a(n-63) +1023*a(n-64) +359*a(n-65) -72*a(n-66) -34*a(n-67) -2*a(n-68) +a(n-69) for n>70

A196956 Number of n X 7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

13, 178, 2987, 78717, 1918608, 46887039, 1147966466, 28133304588, 688970472958, 16871844816740, 413232005901840, 10120704139954048, 247866954036866195, 6070590513451031047, 148677076483267579402, 3641296772946640910171
Offset: 1

Views

Author

R. H. Hardin, Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's.
Column 7 of A196957.

Examples

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

Crossrefs

Cf. A196957.

A196951 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4.

Original entry on oeis.org

1, 5, 26, 492, 23956, 3166711, 1147966466, 1139814557483, 3088781045935076, 22873717950695283084, 463109589156291297397232, 25624345402722028725104412700, 3874850344967499961830383314013710
Offset: 1

Views

Author

R. H. Hardin Oct 08 2011

Keywords

Comments

Every 0 is next to 0 2's, every 1 is next to 1 1's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 0's
Diagonal of A196957

Examples

			Some solutions for n=4
..0..0..1..1....0..1..0..0....1..1..0..0....1..1..0..1....1..0..0..0
..0..0..0..0....0..1..0..1....0..0..4..0....0..0..0..1....1..0..1..1
..1..0..0..1....0..0..0..1....1..1..0..0....0..0..4..0....0..0..0..0
..1..0..0..1....0..0..0..0....0..0..0..0....1..1..0..0....0..1..1..0
		
Showing 1-6 of 6 results.