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%I #5 Mar 31 2012 12:37:20
%S 9,81,281,989,3923,15921,67007,286299,1240603,5420023,23828357,
%T 105188575,465711669,2065999789,9177987717,40811215453,181593070243,
%U 808383490865,3599754765767,16033313059243,71423194026691,318200352273815
%N Number of nX4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically
%C Column 4 of A207960
%H R. H. Hardin, <a href="/A207956/b207956.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 7*a(n-1) +2*a(n-2) -87*a(n-3) +48*a(n-4) +445*a(n-5) -280*a(n-6) -1175*a(n-7) +613*a(n-8) +1664*a(n-9) -614*a(n-10) -1206*a(n-11) +264*a(n-12) +392*a(n-13) -32*a(n-14) -40*a(n-15) for n>16
%e Some solutions for n=4
%e ..0..1..1..0....1..0..0..1....1..1..0..0....0..1..0..0....0..0..1..1
%e ..0..0..1..1....0..1..0..0....0..0..1..0....0..1..1..1....0..1..1..0
%e ..0..1..0..0....1..0..0..1....1..1..0..0....0..1..1..1....0..1..1..1
%e ..0..0..1..1....0..1..0..0....0..1..1..0....0..1..1..1....0..0..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 21 2012
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