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 A299683 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 0
 1, 4, 15, 648, 23116, 5740433, 4582634341, 9172624830461, 66764212816377961 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A299689. LINKS EXAMPLE Some solutions for n=5 ..0..0..1..1..0. .0..0..1..0..1. .0..1..1..0..0. .0..0..1..0..0 ..0..0..1..1..0. .0..0..0..0..0. .1..1..1..0..0. .0..0..1..0..0 ..1..1..0..0..0. .0..0..0..0..0. .1..1..0..1..1. .1..0..0..0..1 ..1..1..0..1..0. .1..0..1..1..0. .0..1..1..1..1. .0..0..1..0..0 ..0..0..0..0..1. .0..1..1..0..1. .0..1..1..1..0. .0..0..0..0..1 CROSSREFS Cf. A299689. Sequence in context: A000881 A109923 A006524 * A295231 A070037 A297859 Adjacent sequences:  A299680 A299681 A299682 * A299684 A299685 A299686 KEYWORD nonn AUTHOR R. H. Hardin, Feb 16 2018 STATUS approved

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Last modified December 3 19:30 EST 2020. Contains 338917 sequences. (Running on oeis4.)