A186059 - OEIS

%I #5 Mar 31 2012 12:36:04

%S 6915,77987,743667,5877960,58408337,545528022,4584860256,44097747372,

%T 410464949409,3514156302617,33311968188317,310167965845840,

%U 2682484283383291,25173951022372310,234600361563324997

%N Number of (n+2)X7 binary arrays with each 3X3 subblock having a positive determinant

%C Column 5 of A186063

%H R. H. Hardin, <a href="/A186059/b186059.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 4X7

%e ..0..1..1..0..0..1..0....1..1..1..1..1..1..1....1..1..0..1..1..0..1

%e ..1..0..0..1..0..0..1....1..0..1..1..0..0..1....0..1..1..1..1..1..1

%e ..1..1..0..1..1..0..0....1..0..0..1..1..0..0....1..0..1..1..0..1..1

%e ..1..1..1..1..0..1..1....1..1..1..0..0..1..0....1..0..0..1..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 11 2011