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 A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's. 1
 1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A297224. LINKS R. H. Hardin, Table of n, a(n) for n = 1..23 EXAMPLE Some solutions for n=5 ..1..1..0..0..0. .0..0..1..1..0. .1..1..0..0..0. .0..1..1..0..0 ..0..0..0..0..0. .0..0..0..1..1. .0..1..1..0..0. .0..0..0..1..1 ..0..1..1..0..0. .1..1..0..0..0. .0..0..1..1..0. .0..0..0..0..0 ..0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1. .0..0..1..0..1 ..0..0..0..0..0. .1..1..0..0..0. .1..1..0..0..0. .0..1..0..1..0 CROSSREFS Cf. A297224. Sequence in context: A240297 A050388 A241980 * A010039 A245407 A162314 Adjacent sequences: A297215 A297216 A297217 * A297219 A297220 A297221 KEYWORD nonn AUTHOR R. H. Hardin, Dec 27 2017 STATUS approved

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Last modified March 25 04:11 EDT 2023. Contains 361511 sequences. (Running on oeis4.)