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 A305679 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 0
 1, 4, 25, 1595, 383910, 351440611, 1172824606532, 14227138873003015, 624906012671792336577 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A305685. LINKS EXAMPLE Some solutions for n=5 ..0..0..0..1..0. .0..1..0..0..0. .0..1..0..0..0. .0..1..0..1..0 ..1..1..0..0..1. .0..1..1..1..1. .0..1..0..1..1. .1..0..0..1..0 ..1..1..0..0..0. .0..0..0..0..1. .1..1..1..0..0. .0..1..0..0..1 ..0..0..1..0..1. .0..1..1..0..0. .1..0..0..1..1. .1..1..0..1..0 ..1..1..0..0..1. .1..0..0..1..1. .1..0..0..1..1. .0..1..0..1..0 CROSSREFS Cf. A305685. Sequence in context: A072882 A014253 A132553 * A317061 A144229 A316926 Adjacent sequences:  A305676 A305677 A305678 * A305680 A305681 A305682 KEYWORD nonn AUTHOR R. H. Hardin, Jun 08 2018 STATUS approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)