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 A302368 Number of 2Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 4
 2, 2, 12, 20, 72, 168, 496, 1296, 3616, 9760, 26816, 73024, 199808, 545408, 1490688, 4071680, 11125248, 30392832, 83037184, 226857984, 619792384, 1693296640, 4626182144, 12638949376, 34530271232, 94338424832, 257737408512 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A302367. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +4*a(n-2) -4*a(n-3) -4*a(n-4) EXAMPLE Some solutions for n=5 ..0..1..0..1..0. .0..0..0..0..1. .0..1..1..1..0. .0..0..1..0..1 ..0..1..0..1..0. .1..0..1..0..0. .1..1..0..1..1. .0..0..0..0..0 CROSSREFS Cf. A302367. Sequence in context: A265458 A054916 A194767 * A346757 A202669 A178845 Adjacent sequences: A302365 A302366 A302367 * A302369 A302370 A302371 KEYWORD nonn AUTHOR R. H. Hardin, Apr 06 2018 STATUS approved

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Last modified December 8 07:08 EST 2022. Contains 358673 sequences. (Running on oeis4.)