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 A268743 Number of n X n binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1
 2, 11, 143, 4110, 255651, 34732937, 10319681062, 6744840113811, 9736268648482947, 31152408949342676906, 221573405414594347811555, 3511390061199964238627005057, 124222798189336185449669887550302 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A268750. LINKS R. H. Hardin, Table of n, a(n) for n = 1..26 EXAMPLE Some solutions for n=4 ..0..0..1..0. .0..1..1..0. .1..0..0..0. .0..0..0..1. .1..0..0..1 ..1..0..0..1. .0..0..0..0. .0..0..1..0. .0..1..0..0. .0..0..0..0 ..0..0..0..0. .0..1..0..1. .0..0..0..1. .0..1..0..1. .0..0..1..0 ..0..0..0..0. .0..0..0..0. .0..1..0..1. .1..0..0..0. .1..1..0..0 CROSSREFS Cf. A268750. Sequence in context: A183609 A113148 A193209 * A204243 A203203 A046912 Adjacent sequences:  A268740 A268741 A268742 * A268744 A268745 A268746 KEYWORD nonn AUTHOR R. H. Hardin, Feb 12 2016 STATUS approved

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Last modified September 18 01:39 EDT 2021. Contains 347504 sequences. (Running on oeis4.)