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.

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A302168 Number of 6Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Original entry on oeis.org

32, 42, 57, 156, 280, 635, 1247, 2815, 5524, 12457, 25230, 55645, 113410, 249611, 517232, 1123390, 2334467, 5059272, 10608909, 22830143, 47940869, 102999865, 217358333, 465280120, 982600249, 2101097147, 4449151154, 9495603067
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2018

Keywords

Comments

Row 6 of A302163.

Examples

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

Crossrefs

Cf. A302163.

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) -a(n-3) +20*a(n-4) -16*a(n-5) -37*a(n-6) +15*a(n-7) -129*a(n-8) +82*a(n-9) +223*a(n-10) -69*a(n-11) +417*a(n-12) -193*a(n-13) -636*a(n-14) +100*a(n-15) -762*a(n-16) +265*a(n-17) +957*a(n-18) +8*a(n-19) +818*a(n-20) -220*a(n-21) -784*a(n-22) -149*a(n-23) -528*a(n-24) +97*a(n-25) +358*a(n-26) +138*a(n-27) +187*a(n-28) -18*a(n-29) -91*a(n-30) -46*a(n-31) -22*a(n-32) +2*a(n-33) +8*a(n-34) +4*a(n-35) for n>45

A302169 Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Original entry on oeis.org

64, 86, 111, 361, 621, 1563, 2853, 7306, 12963, 33522, 61775, 157788, 293072, 746806, 1414502, 3560709, 6821117, 17041351, 33109869, 81878009, 160823108, 394307941, 783258522, 1903510955, 3817195020, 9202579162, 18623741941, 44557228577
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2018

Keywords

Comments

Row 7 of A302163.

Examples

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

Crossrefs

Cf. A302163.

Formula

Empirical recurrence of order 80 (see link above)
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