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%I #5 Dec 01 2014 07:29:20
%S 8,56,464,9130,185620,10753448,539961360,93638134256,11614033584212,
%T 6069296782136816,1858635679067134948,2934840645254762222638,
%U 2219326155667975726270428,10595742529538275240832027216
%N Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge
%C Diagonal of A251258
%H R. H. Hardin, <a href="/A251250/b251250.txt">Table of n, a(n) for n = 1..17</a>
%e Some solutions for n=4
%e ..1..0..1..0..1....1..1..1..1..1....0..0..1..1..1....0..0..1..0..1
%e ..0..0..1..0..1....0..0..0..0..0....1..0..0..0..0....1..0..0..0..0
%e ..1..0..1..0..1....1..0..1..0..1....0..0..1..0..1....1..0..1..0..1
%e ..1..0..0..0..0....1..0..1..0..1....1..0..1..0..1....1..0..0..0..0
%e ..0..0..1..0..1....0..0..1..0..0....1..0..0..0..0....0..0..1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 01 2014
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