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%I #6 Apr 05 2020 22:19:07
%S 26,285,3013,33297,366606,3774137,35026386,290742258,2174611745,
%T 14827903973,93194118189,544831575434,2984722060733,15415176834304,
%U 75441255758231,351377507165460,1563422116701546,6667161613820532
%N Number of n X 5 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 6 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order.
%C Column 5 of A227333.
%H R. H. Hardin, <a href="/A227332/b227332.txt">Table of n, a(n) for n = 1..56</a>
%e Some solutions for n=4
%e ..0..0..0..0..0....0..0..0..1..1....0..1..0..0..0....0..0..0..0..1
%e ..0..0..0..0..0....0..0..1..0..0....1..0..1..1..0....0..1..0..0..0
%e ..1..1..0..1..0....0..0..0..1..0....1..0..0..0..0....0..0..0..1..1
%e ..1..0..0..1..0....1..1..0..0..1....1..0..0..0..0....0..0..0..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jul 07 2013