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%I #3 Mar 31 2012 12:35:08
%S 0,0,1,0,2,0,4,4,7,4,9,8,13,12,19,16,22,20,29,28,37,30
%N 1/2 of the number of islands of ones fitting in an n X n array symmetric under horizontal and vertical reflection with all ones connected only either three adjacent vertically or three adjacent horizontally.
%e 8 X 8 example with 8 islands
%e .1.1.1.0.0.1.1.1
%e .0.0.0.0.0.0.0.0
%e .1.1.1.0.0.1.1.1
%e .0.0.0.0.0.0.0.0
%e .0.0.0.0.0.0.0.0
%e .1.1.1.0.0.1.1.1
%e .0.0.0.0.0.0.0.0
%e .1.1.1.0.0.1.1.1
%K nonn
%O 1,5
%A _R. H. Hardin_, Oct 20 2008
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