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A268782

Number of n X n binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.

+0
1

0, 5, 72, 1714, 67100, 4725018, 611932378, 148013550916, 67580406047498, 58605374440440754, 97015414668307967168, 307604236621005318739500, 1873151902121241161650454526, 21951627197224261891003815976598

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OFFSET

1,2

COMMENTS

Diagonal of A268789.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268789.

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

STATUS

approved

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