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 A302303 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
 1, 3, 13, 66, 445, 5715, 76642, 2150420, 124691962, 17216491876 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A302309. LINKS EXAMPLE Some solutions for n=5 ..0..1..0..0..1. .0..1..0..0..1. .0..0..1..0..1. .0..1..0..1..1 ..1..1..0..1..0. .0..1..0..1..0. .1..1..1..0..0. .0..1..1..0..1 ..0..1..0..1..0. .0..1..0..1..0. .0..0..0..0..0. .1..0..1..0..1 ..0..1..0..1..1. .0..1..0..1..0. .0..1..0..0..1. .1..0..1..0..1 ..1..0..0..1..0. .0..0..0..1..0. .0..1..1..1..1. .1..0..1..0..1 CROSSREFS Cf. A302309. Sequence in context: A045743 A110530 A142979 * A201713 A343204 A333083 Adjacent sequences:  A302300 A302301 A302302 * A302304 A302305 A302306 KEYWORD nonn AUTHOR R. H. Hardin, Apr 05 2018 STATUS approved

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Last modified August 5 01:32 EDT 2021. Contains 346456 sequences. (Running on oeis4.)