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 A297987 Number of nXn 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 0
 0, 4, 48, 466, 5100, 74675, 1276012, 30240388, 1056360518, 50037661325, 3406737828874, 353272517327686, 52791942245108114 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A297993. LINKS EXAMPLE Some solutions for n=6 ..0..0..1..0..0..0. .0..1..1..1..1..0. .0..1..0..0..1..0. .0..1..1..1..1..1 ..1..1..0..1..1..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .0..0..0..0..0..1 ..0..1..0..1..0..1. .1..1..1..0..1..1. .0..1..0..1..1..1. .1..1..1..1..1..0 ..0..0..0..1..0..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .1..0..0..0..0..1 ..0..1..0..1..1..0. .1..1..1..1..1..0. .0..1..0..1..0..1. .1..0..1..1..0..1 ..0..1..1..0..0..1. .0..0..0..0..0..0. .1..1..0..1..1..0. .1..1..0..1..0..1 CROSSREFS Cf. A297993. Sequence in context: A111903 A059409 A297816 * A298842 A298649 A299603 Adjacent sequences:  A297984 A297985 A297986 * A297988 A297989 A297990 KEYWORD nonn AUTHOR R. H. Hardin, Jan 10 2018 STATUS approved

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Last modified April 25 18:12 EDT 2019. Contains 322461 sequences. (Running on oeis4.)