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 A268767 Number of n X n 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
 0, 12, 112, 2296, 64112, 3104544, 255353744, 36091542548, 8990276037592, 3911658481295924, 3022669494445395808, 4128305052223833006600, 10045914708457218016317000, 43496963453603913793217952196 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A268774. LINKS R. H. Hardin, Table of n, a(n) for n = 1..17 EXAMPLE Some solutions for n=4 ..0..1..0..0. .1..2..2..2. .2..2..2..2. .0..1..0..0. .1..0..0..0 ..0..0..1..0. .1..2..2..2. .2..2..2..2. .1..0..0..0. .0..0..1..0 ..0..0..0..0. .2..2..2..2. .2..2..2..1. .0..0..0..0. .1..0..0..0 ..0..1..0..0. .2..1..2..2. .2..2..2..1. .1..0..1..0. .1..0..0..1 CROSSREFS Cf. A268774. Sequence in context: A016152 A089700 A290742 * A221368 A083767 A285154 Adjacent sequences: A268764 A268765 A268766 * A268768 A268769 A268770 KEYWORD nonn AUTHOR R. H. Hardin, Feb 13 2016 STATUS approved

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Last modified June 4 21:13 EDT 2023. Contains 363130 sequences. (Running on oeis4.)