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 A302218 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
 0, 3, 43, 934, 40395, 3420704, 553097760, 177191137344, 102914156897887, 122108799039662692 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A302224. LINKS EXAMPLE Some solutions for n=5 ..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1 ..1..1..1..1..1. .1..1..0..0..1. .1..1..1..0..1. .1..0..1..0..1 ..1..0..0..0..1. .1..1..1..1..1. .0..0..0..1..0. .0..1..1..0..0 ..0..1..1..1..0. .0..0..0..0..0. .1..1..0..1..1. .0..0..0..1..0 ..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .1..1..1..1..1 CROSSREFS Cf. A302224. Sequence in context: A350924 A141060 A277496 * A302664 A201784 A340822 Adjacent sequences: A302215 A302216 A302217 * A302219 A302220 A302221 KEYWORD nonn AUTHOR R. H. Hardin, Apr 03 2018 STATUS approved

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Last modified December 9 09:46 EST 2022. Contains 358700 sequences. (Running on oeis4.)