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Number of (n+2)X7 binary arrays with each 3X3 subblock singular
1

%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