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%I #5 Mar 31 2012 12:37:19
%S 9,81,189,441,2163,10609,33063,103041,418263,1697809,5875227,20331081,
%T 77333859,294156801,1057136187,3799119769,14123193995,52502848225,
%U 191262879795,696752470089,2569117858827,9473043664561,34677617171731
%N Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically
%C Row 4 of A207729
%H R. H. Hardin, <a href="/A207731/b207731.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-1) +12*a(n-3) +98*a(n-4) +12*a(n-5) +34*a(n-6) -230*a(n-7) -1980*a(n-8) -508*a(n-9) +340*a(n-10) +840*a(n-11) +9800*a(n-12) +3000*a(n-13) +2000*a(n-15) -10000*a(n-16)
%e Some solutions for n=4
%e ..1..0..1..1....1..1..1..0....0..0..1..1....1..1..0..1....1..1..0..0
%e ..1..1..1..1....0..1..1..1....0..1..1..1....1..1..0..1....1..1..0..1
%e ..0..0..1..1....0..1..1..0....1..0..1..1....1..0..0..1....1..1..1..0
%e ..0..0..1..1....1..1..0..0....0..0..1..1....1..0..0..1....1..1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 19 2012
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