A268988 - OEIS

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A268988

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

2, 13, 174, 6009, 421450, 66954420, 22995344760, 17373640598542, 29082748697180602, 107300241515211644436, 883523091936988991189604, 16140842052133986432421342048, 659806253617230823177640504040304

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OFFSET

1,1

COMMENTS

Diagonal of A268995.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268995.

Sequence in context: A006905 A119400 A182314 * A183606 A366194 A307655

Adjacent sequences: A268985 A268986 A268987 * A268989 A268990 A268991

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2016

STATUS

approved