%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(n1) +23*a(n2) 102*a(n3) 288*a(n4) +250*a(n5) +787*a(n6) 238*a(n7) 741*a(n8) +124*a(n9) +196*a(n10) 16*a(n11) 16*a(n12) 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
