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 A305905 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 0
 1, 4, 35, 396, 15460, 595490, 42789430, 7157370110, 1710658272713, 714934693797269 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A305911. LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=5 ..0..0..0..0..0. .0..1..0..1..0. .0..1..1..1..1. .0..0..0..0..1 ..1..0..0..0..0. .1..0..0..0..1. .0..0..0..1..1. .1..1..0..1..0 ..1..0..0..1..1. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0 ..1..1..1..1..1. .0..0..0..0..0. .0..1..0..0..0. .0..0..0..0..1 ..1..0..0..1..1. .1..1..0..1..0. .1..0..0..1..0. .0..0..0..1..0 CROSSREFS Cf. A305911. Sequence in context: A215541 A104456 A277868 * A324314 A123224 A160887 Adjacent sequences: A305902 A305903 A305904 * A305906 A305907 A305908 KEYWORD nonn AUTHOR R. H. Hardin, Jun 14 2018 STATUS approved

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Last modified February 26 02:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)