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%I #3 Mar 31 2012 12:35:49
%S 61398,74784,91122,112500,162882,242784,386406,750312,1548594,3449484,
%T 8634042,22315320,59561118,166095504,468837162,1339623540,3893978322,
%U 11377279584,33414823926,98854539192,293124225474,871179943644
%N Number of (n+2)X9 binary matrices with every 3X3 block having exactly four 1's
%C Column 7 of A181262
%H R. H. Hardin, <a href="/A181261/b181261.txt">Table of n, a(n) for n=1..46</a>
%e Some solutions for 3X9
%e ..0..0..1..0..0..1..0..0..1....0..0..0..1..0..0..0..0..1
%e ..1..1..1..1..1..1..1..0..1....0..0..1..0..0..1..0..1..0
%e ..0..0..0..0..0..0..0..1..0....1..1..1..0..1..1..1..0..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Oct 10 2010
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