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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

%I

%S 81,666,3258,24192,149358,971844,6053094,37741920,231943614,

%T 1417576284,8599619586,51899214960,311654917170,1863739501308,

%U 11103704855298,65935768579488,390381077316294,2305171593612444,13579182450069246

%N Number of 4Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

%C Row 4 of A269052.

%H R. H. Hardin, <a href="/A269055/b269055.txt">Table of n, a(n) for n = 1..210</a>

%F 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

%e Some solutions for n=4

%e ..0..0..1..2. .1..2..1..0. .1..2..1..0. .2..2..2..2. .1..0..1..2

%e ..1..0..1..0. .0..0..1..0. .2..2..2..2. .2..2..1..0. .1..2..1..2

%e ..1..2..1..2. .1..0..1..0. .2..1..2..1. .2..2..1..0. .2..2..2..2

%e ..1..0..2..2. .1..0..0..0. .2..1..0..1. .1..2..1..2. .1..1..2..1

%Y Cf. A269052.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 18 2016

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Last modified June 22 02:59 EDT 2021. Contains 345367 sequences. (Running on oeis4.)