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 A269046 Number of nXn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
 3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A269052. LINKS R. H. Hardin, Table of n, a(n) for n = 1..14 EXAMPLE Some solutions for n=4 ..2..0..1..2. .1..2..1..2. .0..2..1..0. .2..2..2..2. .0..2..1..2 ..1..2..1..0. .1..2..1..0. .1..0..1..0. .1..1..2..2. .1..0..1..2 ..1..2..1..0. .1..0..1..0. .0..0..0..0. .2..2..2..1. .0..0..1..0 ..1..0..1..0. .1..2..0..0. .0..0..0..1. .1..2..2..2. .0..0..1..0 CROSSREFS Cf. A269052. Sequence in context: A173936 A219619 A097068 * A092470 A206820 A157542 Adjacent sequences:  A269043 A269044 A269045 * A269047 A269048 A269049 KEYWORD nonn AUTHOR R. H. Hardin, Feb 18 2016 STATUS approved

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Last modified October 18 00:15 EDT 2019. Contains 328135 sequences. (Running on oeis4.)