%I #5 Mar 31 2012 12:36:04
%S 434174,23369314,1231779874,56374248542,2795398080908,137706977983060,
%T 6706785849517148,329259361852366620,16148770445584988556,
%U 791374910346450939836,38812042507333999328862,1903281945814156244309626
%N Number of (n+2)X7 binary arrays with each 3X3 subblock singular
%C Column 5 of A186052
%H R. H. Hardin, <a href="/A186048/b186048.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 4X7
%e ..0..0..0..1..0..1..1....0..0..0..1..1..0..0....0..0..0..1..1..0..0
%e ..0..0..0..1..0..0..0....0..0..0..0..1..0..1....0..0..1..0..0..0..0
%e ..0..0..1..1..0..0..1....0..0..0..0..1..0..1....0..0..0..1..1..0..1
%e ..0..0..0..1..0..1..1....0..0..0..0..0..0..0....0..0..1..0..0..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 11 2011