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%I #5 Mar 31 2012 12:37:20
%S 9,81,297,989,3080,9994,32358,104176,335940,1083914,3495930,11275444,
%T 36368274,117303034,378351488,1220339904,3936101206,12695569864,
%U 40948497182,132075911156,425999751988,1374026441136,4431806698176
%N Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically
%C Row 4 of A207960
%H R. H. Hardin, <a href="/A207962/b207962.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-1) +3*a(n-2) +11*a(n-3) +11*a(n-4) -a(n-5) -20*a(n-6) -27*a(n-7) -5*a(n-8) +20*a(n-9) +13*a(n-10) -3*a(n-11) -4*a(n-12) for n>15
%e Some solutions for n=4
%e ..0..0..1..1....1..0..0..1....1..1..1..1....1..1..1..0....1..0..0..1
%e ..1..1..0..0....1..0..0..1....1..1..0..0....0..1..1..0....0..1..1..0
%e ..1..1..1..1....1..0..0..1....0..1..1..1....1..1..1..0....1..0..0..1
%e ..1..1..0..0....1..0..0..1....1..0..0..1....1..1..1..0....1..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 21 2012
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