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 A296329 Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 0 or 2 neighboring 1s. 2
 3, 8, 19, 47, 116, 286, 705, 1738, 4285, 10564, 26044, 64208, 158296, 390257, 962125, 2371987, 5847808, 14416967, 35543051, 87626508, 216031114, 532595025, 1313039846, 3237119305, 7980672808, 19675252120, 48506630368, 119586431488 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A296335. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 2*a(n-2) + 3*a(n-3) + 2*a(n-4) + a(n-5). Empirical g.f.: x*(3 + 5*x + 5*x^2 + 3*x^3 + x^4) / (1 - x - 2*x^2 - 3*x^3 - 2*x^4 - x^5). - Colin Barker, Mar 22 2018 EXAMPLE Some solutions for n=5: ..1..0. .0..0. .1..0. .0..0. .1..0. .0..0. .1..0. .1..0. .0..0. .1..0 ..0..0. .1..0. .0..0. .0..0. .0..1. .0..0. .0..0. .0..1. .0..1. .0..1 ..0..0. .0..0. .0..0. .0..1. .0..0. .1..1. .1..0. .0..0. .0..0. .0..0 ..0..1. .0..0. .0..0. .0..0. .0..1. .1..0. .0..0. .0..0. .0..0. .0..1 ..1..1. .1..0. .0..1. .0..1. .0..0. .0..1. .0..0. .1..0. .1..0. .1..1 CROSSREFS Cf. A296335. Sequence in context: A284942 A121811 A244208 * A339525 A295045 A181849 Adjacent sequences: A296326 A296327 A296328 * A296330 A296331 A296332 KEYWORD nonn AUTHOR R. H. Hardin, Dec 10 2017 STATUS approved

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Last modified September 30 21:59 EDT 2023. Contains 365812 sequences. (Running on oeis4.)