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.

A281600 Number of n X 3 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

4, 29, 209, 1623, 12413, 95623, 736757, 5678559, 43771933, 337417047, 2601018757, 20050333455, 154561132461, 1191459205767, 9184555212821, 70800627012031, 545778076046781, 4207218532446903, 32432024283432101, 250007502993994607
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Examples

			Some solutions for n=4:
..0..1..2. .0..1..2. .0..0..1. .0..1..0. .0..1..1. .0..1..2. .0..1..0
..2..1..0. .2..1..2. .2..1..2. .0..1..0. .0..2..0. .0..2..0. .0..1..0
..2..1..2. .2..0..0. .2..0..2. .0..1..2. .2..1..0. .0..2..0. .2..1..2
..0..0..1. .2..1..1. .2..0..2. .2..1..2. .2..0..2. .1..1..0. .0..0..1
		

Crossrefs

Column 3 of A281605.

Formula

Empirical: a(n) = 7*a(n-1) + 10*a(n-2) - 26*a(n-3) - 64*a(n-4) - 40*a(n-5) for n>6.
Empirical g.f.: x*(4 + x - 34*x^2 - 26*x^3 - 28*x^4 - 48*x^5) / (1 - 7*x - 10*x^2 + 26*x^3 + 64*x^4 + 40*x^5). - Colin Barker, Feb 20 2019

A281601 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

11, 110, 1283, 16198, 203276, 2563481, 32354824, 408458506, 5156857179, 65107404580, 822011501060, 10378295092963, 131031076361292, 1654331920396230, 20886756502623605, 263705605573971334
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Column 4 of A281605.

Examples

			Some solutions for n=4
..0..1..1..0. .0..1..0..1. .0..1..2..1. .0..1..0..1. .0..0..1..0
..2..0..2..0. .0..1..0..2. .2..1..2..1. .2..1..0..2. .1..2..1..0
..2..1..1..0. .0..2..1..0. .0..1..2..1. .0..1..0..1. .1..2..1..2
..0..0..2..0. .1..2..1..2. .0..1..2..1. .0..1..0..1. .1..0..1..2
		

Crossrefs

Cf. A281605.

Formula

Empirical: a(n) = 13*a(n-1) +3*a(n-2) -87*a(n-3) -125*a(n-4) -116*a(n-5) +69*a(n-6) +522*a(n-7) -148*a(n-8) -199*a(n-9) +690*a(n-10) -105*a(n-11) -265*a(n-12) -155*a(n-13) -84*a(n-14) -23*a(n-15) -13*a(n-16) for n>18

A281602 Number of nX5 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

30, 442, 8180, 167545, 3401430, 69506779, 1421127262, 29066686772, 594539026170, 12161158312943, 248754881654232, 5088256100638530, 104079805217582244, 2128942973242332029, 43547336604707609360, 890756851949851865902
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Column 5 of A281605.

Examples

			Some solutions for n=4
..0..1..1..0..2. .0..1..0..1..2. .0..1..2..0..2. .0..1..0..2..0
..2..0..2..0..2. .0..1..2..1..0. .1..0..2..1..2. .0..2..0..1..0
..2..0..1..0..2. .0..1..0..1..0. .1..0..2..0..0. .1..1..0..1..2
..2..1..2..0..1. .2..1..2..2..0. .2..0..1..1..2. .0..2..2..1..0
		

Crossrefs

Cf. A281605.

Formula

Empirical: a(n) = 24*a(n-1) -47*a(n-2) -552*a(n-3) +408*a(n-4) +3664*a(n-5) +11951*a(n-6) +4496*a(n-7) -51712*a(n-8) -608027*a(n-9) +618602*a(n-10) +3874985*a(n-11) -3781199*a(n-12) -16785095*a(n-13) +11073712*a(n-14) +71617473*a(n-15) -132533827*a(n-16) +121433498*a(n-17) -95249752*a(n-18) +148536078*a(n-19) -176780273*a(n-20) -59040921*a(n-21) +269285969*a(n-22) -308246859*a(n-23) +159030948*a(n-24) -64978465*a(n-25) +40730650*a(n-26) +67888637*a(n-27) -98865108*a(n-28) +15454808*a(n-29) +69306797*a(n-30) -40262490*a(n-31) -40951058*a(n-32) +48761392*a(n-33) -12747670*a(n-34) -7345822*a(n-35) +6634632*a(n-36) -1752064*a(n-37) +175688*a(n-38) -11428*a(n-39) -792*a(n-40) for n>42

A281603 Number of nX6 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

82, 1708, 49572, 1626073, 52899445, 1732267694, 56764280423, 1860912910152, 61012156448915, 2000405755119383, 65587722113126449, 2150442541118935258, 70507185356580640501, 2311739967430549263763, 75795706200446791975455
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Column 6 of A281605.

Examples

			Some solutions for n=3
..0..1..0..2..1..0. .0..1..2..1..0..1. .0..1..0..1..2..0. .0..1..1..0..1..1
..0..2..1..0..1..0. .0..1..0..1..0..2. .2..2..0..1..0..2. .0..2..2..0..2..0
..2..0..1..2..1..2. .0..1..2..1..2..1. .1..1..0..1..0..1. .0..1..0..1..2..1
		

Crossrefs

Cf. A281605.

A281606 Number of 3Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

5, 50, 209, 1283, 8180, 49572, 302304, 1849212, 11295326, 69003066, 421598546, 2575763454, 15736620000, 96143466614, 587391366384, 3588683849428, 21925168436114, 133952450888038, 818386359248384, 4999955088202190
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Row 3 of A281605.

Examples

			Some solutions for n=4
..0..1..0..1. .0..1..0..1. .0..1..0..2. .0..1..2..1. .0..1..1..0
..2..1..2..1. .0..1..2..1. .0..2..0..2. .1..2..0..1. .2..0..2..2
..2..0..2..0. .2..1..0..0. .1..2..0..1. .0..2..0..2. .2..1..1..0
		

Crossrefs

Cf. A281605.

Formula

Empirical: a(n) = 6*a(n-1) -4*a(n-2) +29*a(n-3) -15*a(n-4) +73*a(n-5) +11*a(n-6) -32*a(n-7) +6*a(n-8) +a(n-9) -30*a(n-10) -26*a(n-11) +10*a(n-12) +8*a(n-13) for n>15

A281607 Number of 4Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

14, 285, 1623, 16198, 167545, 1626073, 15975093, 157271995, 1545421328, 15189232151, 149300998270, 1467524054601, 14424777071936, 141785299554627, 1393649553888429, 13698600339828853, 134647609111781265
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Row 4 of A281605.

Examples

			Some solutions for n=4
..0..1..0..2. .0..1..0..1. .0..1..2..1. .0..1..0..2. .0..1..1..2
..0..1..2..1. .0..1..2..0. .2..1..2..0. .2..2..1..2. .2..0..2..0
..2..1..2..0. .0..1..2..1. .0..1..0..2. .0..0..1..0. .2..1..2..0
..0..1..0..1. .0..1..0..1. .0..2..0..1. .2..1..2..2. .2..0..2..0
		

Crossrefs

Cf. A281605.

Formula

Empirical: a(n) = 10*a(n-1) -15*a(n-2) +156*a(n-3) -380*a(n-4) +1391*a(n-5) -1460*a(n-6) +8345*a(n-7) -10168*a(n-8) -34575*a(n-9) +11685*a(n-10) +87520*a(n-11) -120741*a(n-12) -46402*a(n-13) +308504*a(n-14) -291257*a(n-15) -810689*a(n-16) +2625692*a(n-17) +2952825*a(n-18) -7688340*a(n-19) -5922696*a(n-20) +14554357*a(n-21) +5415000*a(n-22) -20140889*a(n-23) -1385535*a(n-24) +16904842*a(n-25) -5049800*a(n-26) -10379567*a(n-27) +5599204*a(n-28) +8253535*a(n-29) +1477700*a(n-30) -8713925*a(n-31) -5788589*a(n-32) +4890300*a(n-33) +7223068*a(n-34) +5210774*a(n-35) +2211358*a(n-36) -1353769*a(n-37) -3144958*a(n-38) -1967844*a(n-39) +184866*a(n-40) +874807*a(n-41) -332803*a(n-42) -12906*a(n-43) +212033*a(n-44) +14752*a(n-45) -77187*a(n-46) -21761*a(n-47) +8570*a(n-48) +10358*a(n-49) +283*a(n-50) -2122*a(n-51) -298*a(n-52) +252*a(n-53) +32*a(n-54) -8*a(n-55) for n>58

A281608 Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

41, 1617, 12413, 203276, 3401430, 52899445, 839574485, 13329701847, 211084448862, 3344465302550, 52990220564149, 839547337612225, 13301641083138936, 210748236247015012, 3339047332719365760
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Row 5 of A281605.

Examples

			Some solutions for n=3
..0..0..1. .0..1..2. .0..1..0. .0..1..2. .0..1..2. .0..1..1. .0..1..0
..2..1..2. .1..2..0. .0..1..2. .1..2..0. .2..0..2. .0..2..0. .0..1..2
..2..0..2. .0..2..1. .2..1..2. .1..2..1. .2..0..1. .0..2..0. .0..2..1
..1..0..1. .0..1..0. .1..0..2. .0..2..0. .0..2..1. .1..2..1. .0..2..0
..1..0..1. .0..2..2. .1..0..2. .0..1..1. .0..2..0. .1..0..1. .1..2..1
		

Crossrefs

Cf. A281605.

A281609 Number of 6Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

122, 9188, 95623, 2563481, 69506779, 1732267694, 44428349137, 1138837839480, 29102840547371, 744335104686091, 19034344218360000, 486715748229292254, 12445950255418792107, 318255588377585182015, 8138127052120466124265
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Row 6 of A281605.

Examples

			Some solutions for n=3
..0..1..2. .0..1..0. .0..1..0. .0..0..1. .0..1..2. .0..1..0. .0..1..1
..2..1..2. .2..2..0. .0..2..0. .2..2..1. .0..2..1. .0..2..1. .2..0..2
..2..1..2. .1..0..1. .2..1..0. .0..0..1. .1..2..0. .1..0..1. .1..0..1
..2..0..2. .1..0..2. .1..0..2. .1..2..2. .1..0..1. .1..0..1. .1..0..1
..0..1..2. .2..0..1. .1..0..1. .0..1..0. .1..2..1. .2..0..2. .2..2..1
..2..1..0. .1..0..1. .2..2..0. .2..1..0. .1..0..1. .1..1..2. .0..0..1
		

Crossrefs

Cf. A281605.

A281604 Number of n X 7 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

224, 6596, 302304, 15975093, 839574485, 44428349137, 2352459742664, 124612725916938, 6601564375598261, 349739353333596632
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Column 7 of A281605.

Examples

			Some solutions for n=2
..0..1..2..0..2..0..2. .0..0..1..0..2..1..0. .0..1..0..1..2..0..1
..1..0..2..0..2..1..1. .1..2..1..0..2..1..2. .0..2..2..1..0..2..1
		

Crossrefs

Cf. A281605.

A281610 Number of 7Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Original entry on oeis.org

365, 52193, 736757, 32354824, 1421127262, 56764280423, 2352459742664, 97337283237331, 4014393674152359
Offset: 1

Views

Author

R. H. Hardin, Jan 25 2017

Keywords

Comments

Row 7 of A281605.

Examples

			Some solutions for n=2
..0..1. .0..0. .0..0. .0..1. .0..1. .0..1. .0..0. .0..1. .0..1. .0..1
..0..1. .1..2. .1..1. .2..0. .0..2. .0..2. .1..1. .2..1. .2..1. .2..1
..2..0. .0..1. .0..0. .1..2. .0..1. .0..2. .2..2. .1..0. .2..0. .2..0
..1..2. .2..0. .2..1. .1..2. .2..1. .0..2. .0..0. .2..0. .2..1. .0..1
..1..0. .2..0. .2..0. .2..1. .2..0. .1..0. .1..2. .0..2. .1..0. .2..1
..2..0. .0..1. .1..0. .2..1. .0..1. .1..0. .1..0. .0..2. .1..2. .0..2
..1..0. .0..2. .0..1. .2..0. .0..1. .2..2. .1..2. .0..2. .2..0. .0..1
		

Crossrefs

Cf. A281605.
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