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%I #5 Mar 31 2012 12:36:08
%S 1472,18792,237650,3029032,38586679,491649803,6264576384,79823385565,
%T 1017110076243,12960036515411,165137035418995,2104179269485804,
%U 26811492792678275,341632558227269955,4353088643047986551
%N Half the number of (n+2)X4 binary arrays with each 3X3 subblock having sum 3, 4, 5 or 6
%C Column 2 of A187317
%H R. H. Hardin, <a href="/A187310/b187310.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=12*a(n-1)+15*a(n-2)-37*a(n-3)-410*a(n-4)-551*a(n-5)+3600*a(n-6)+5558*a(n-7)-8726*a(n-8)-46631*a(n-9)-18772*a(n-10)+120881*a(n-11)+191220*a(n-12)-28195*a(n-13)-325390*a(n-14)-249390*a(n-15)+47034*a(n-16)+328056*a(n-17)+269892*a(n-18)-88272*a(n-19)-548424*a(n-20)-327888*a(n-21)+220320*a(n-22)+178848*a(n-23)-128304*a(n-24)-139968*a(n-25)
%e Some solutions for 6X4 with a(1,1)=0
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
%e ..0..1..0..1....0..0..1..0....0..1..0..0....0..0..1..1....0..1..0..0
%e ..1..1..0..0....0..1..1..0....0..1..1..0....0..1..1..1....0..1..1..0
%e ..1..0..0..1....0..1..1..1....0..1..1..1....1..1..0..0....0..0..0..0
%e ..0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0....0..0..1..1
%e ..1..1..0..1....1..1..0..0....0..1..1..1....0..1..1..0....1..1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 08 2011
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