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Number of nXn n X n binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
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R. H. Hardin, <a href="/A269082/b269082.txt">Table of n, a(n) for n = 1..26</a>
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Number of nXn binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
2, 11, 114, 2238, 80422, 5372270, 673690710, 159449028034, 71709929917104, 61507638902069052, 100988524469068110876, 318195132133780181426070, 1928131640777904103958251102, 22507425106868892327680953474828
1,1
Diagonal of A269089.
Some solutions for n=4
..0..1..0..0. .1..1..0..1. .0..0..0..1. .0..1..0..0. .1..0..1..1
..1..0..0..0. .0..0..0..0. .1..0..0..0. .0..0..0..1. .0..0..0..0
..0..0..0..0. .0..0..0..1. .1..0..1..0. .0..0..0..0. .1..0..0..1
..0..1..0..1. .1..0..0..0. .0..0..0..0. .1..0..0..0. .0..1..0..0
Cf. A269089.
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nonn
R. H. Hardin, Feb 19 2016
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