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R. H. Hardin, <a href="/A269072/b269072.txt">Table of n, a(n) for n = 1..210</a>

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Number of nX5 binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

23, 185, 1887, 17713, 165607, 1529241, 14011359, 127528641, 1154377943, 10400164377, 93314875007, 834244316721, 7434343205095, 66061046189497, 585498663953471, 5177144091416833, 45680435610848791, 402277442193052665

1,1

Column 5 of A269075.

Empirical: a(n) = 24*a(n-1) -198*a(n-2) +584*a(n-3) +137*a(n-4) -2864*a(n-5) +1132*a(n-6) +4336*a(n-7) -1391*a(n-8) -2280*a(n-9) +90*a(n-10) +200*a(n-11) -25*a(n-12)

Some solutions for n=4

..0..1..0..0..1. .1..0..0..1..0. .1..0..1..0..1. .1..0..1..0..1

..1..0..0..0..1. .1..0..1..0..0. .1..0..1..0..0. .0..0..1..0..1

..1..0..0..0..0. .1..0..0..0..1. .0..0..0..0..1. .0..1..0..0..1

..0..0..0..0..1. .0..0..0..0..1. .0..0..0..1..0. .0..0..0..0..1

Cf. A269075.

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R. H. Hardin, Feb 19 2016

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