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%I #7 Jan 14 2017 01:46:10
%S 5,24,156,1123,8268,60569,446426,3333345,25146354,190958245,
%T 1457049922,11161985897,85804483994,661561762629,5113755311738,
%U 39616036230913,307500608317658,2390939974122621,18619094389326362,145193529732807545
%N 1/4 the number of (n+1) X 3 binary arrays with equal numbers of 2 X 2 subblocks with sums 1 and 3.
%C Column 2 of A184604.
%H R. H. Hardin, <a href="/A184597/b184597.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 5 X 3:
%e ..0..0..0....0..0..1....1..0..1....0..1..1....0..1..1....1..1..0....0..0..1
%e ..1..1..1....1..1..0....1..0..0....0..0..0....0..0..0....1..1..0....0..1..1
%e ..0..0..1....0..0..0....0..0..1....0..0..0....0..0..1....1..1..0....0..0..0
%e ..0..0..0....1..1..1....1..1..1....0..1..1....1..1..0....0..0..1....0..1..1
%e ..0..0..0....1..0..0....0..1..0....1..1..0....0..1..1....1..1..0....1..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 18 2011
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