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 A318337 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 2
 1, 6, 20, 67, 393, 4133, 86487, 3590263, 285034170, 43174729552, 12383193287684, 6712873423988949, 6871475875643572553, 13272675681120501977922, 48367944991570243925176462, 332490278773637201581189154380 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A318343. LINKS R. H. Hardin, Table of n, a(n) for n = 1..17 EXAMPLE Some solutions for n=5 ..0..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0. .0..1..1..1..1 ..0..1..1..1..1. .0..1..0..0..0. .0..0..0..0..0. .1..1..1..1..0 ..0..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0. .1..1..1..0..0 ..0..1..1..1..1. .0..0..0..0..0. .0..0..1..0..0. .1..1..0..0..0 ..0..1..1..1..0. .1..1..1..1..1. .0..0..0..0..0. .1..0..0..0..0 CROSSREFS Cf. A318343. Sequence in context: A027107 A247307 A279215 * A264307 A050930 A074353 Adjacent sequences: A318334 A318335 A318336 * A318338 A318339 A318340 KEYWORD nonn AUTHOR R. H. Hardin, Aug 24 2018 STATUS approved

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Last modified December 4 07:54 EST 2023. Contains 367557 sequences. (Running on oeis4.)