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 A269078 Number of 4 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
 16, 89, 537, 3288, 17713, 102545, 542112, 2991561, 15699273, 84015848, 437869217, 2298582593, 11896438960, 61665786297, 317089210745, 1629210973432, 8329629544721, 42518834195697, 216316340106688, 1098583548812969 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) + 28*a(n-2) - 78*a(n-3) - 264*a(n-4) + 296*a(n-5) + 527*a(n-6) - 252*a(n-7) - 324*a(n-8). Empirical g.f.: x*(16 + 25*x - 267*x^2 - 104*x^3 + 691*x^4 + 275*x^5 - 576*x^6 - 324*x^7) / (1 - 2*x - 16*x^2 + 7*x^3 + 18*x^4)^2. - Colin Barker, Jan 19 2019 EXAMPLE Some solutions for n=4: ..0..1..0..1. .1..0..1..0. .0..0..0..1. .0..0..0..1. .0..0..1..1 ..0..1..0..1. .0..0..0..1. .1..0..0..1. .0..0..0..1. .1..0..0..0 ..0..0..0..1. .1..0..0..0. .0..0..0..0. .0..1..0..0. .1..0..1..0 ..1..1..0..1. .0..0..0..1. .0..1..0..0. .0..0..0..0. .0..0..1..0 CROSSREFS Row 4 of A269075. Sequence in context: A301888 A302084 A229399 * A240262 A264531 A192129 Adjacent sequences: A269075 A269076 A269077 * A269079 A269080 A269081 KEYWORD nonn AUTHOR R. H. Hardin, Feb 19 2016 STATUS approved

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Last modified December 4 02:35 EST 2023. Contains 367541 sequences. (Running on oeis4.)