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 A302723 Number of nXn 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
 0, 3, 22, 89, 1307, 20842, 532511, 17200486, 683140749, 61552556640 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A302728. LINKS EXAMPLE Some solutions for n=5 ..0..1..0..0..1. .0..0..1..1..1. .0..1..0..1..1. .0..1..1..1..0 ..0..0..1..1..0. .1..1..1..0..1. .1..0..0..0..1. .1..0..0..0..1 ..0..0..1..0..1. .1..0..0..0..1. .0..1..1..1..1. .1..1..1..1..1 ..1..1..1..0..1. .1..0..1..1..1. .1..1..1..1..0. .1..1..0..1..1 ..1..0..0..1..0. .1..1..1..0..0. .0..0..1..0..0. .0..0..1..0..0 CROSSREFS Cf. A302728. Sequence in context: A275290 A277228 A302272 * A095663 A254332 A009029 Adjacent sequences:  A302720 A302721 A302722 * A302724 A302725 A302726 KEYWORD nonn AUTHOR R. H. Hardin, Apr 12 2018 STATUS approved

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Last modified January 23 01:15 EST 2020. Contains 331166 sequences. (Running on oeis4.)