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 A269055 Number of 4Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once. 1
 81, 666, 3258, 24192, 149358, 971844, 6053094, 37741920, 231943614, 1417576284, 8599619586, 51899214960, 311654917170, 1863739501308, 11103704855298, 65935768579488, 390381077316294, 2305171593612444, 13579182450069246 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A269052. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 6*a(n-1) +23*a(n-2) -102*a(n-3) -288*a(n-4) +250*a(n-5) +787*a(n-6) -238*a(n-7) -741*a(n-8) +124*a(n-9) +196*a(n-10) -16*a(n-11) -16*a(n-12) for n>14 EXAMPLE Some solutions for n=4 ..0..0..1..2. .1..2..1..0. .1..2..1..0. .2..2..2..2. .1..0..1..2 ..1..0..1..0. .0..0..1..0. .2..2..2..2. .2..2..1..0. .1..2..1..2 ..1..2..1..2. .1..0..1..0. .2..1..2..1. .2..2..1..0. .2..2..2..2 ..1..0..2..2. .1..0..0..0. .2..1..0..1. .1..2..1..2. .1..1..2..1 CROSSREFS Cf. A269052. Sequence in context: A236720 A187441 A187433 * A236876 A185366 A232026 Adjacent sequences:  A269052 A269053 A269054 * A269056 A269057 A269058 KEYWORD nonn AUTHOR R. H. Hardin, Feb 18 2016 STATUS approved

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Last modified May 9 12:58 EDT 2021. Contains 343742 sequences. (Running on oeis4.)