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A146138 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation. 0

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,9,9,33,33,153,153,3123,3123,118071,118071,4682615,

%T 4682615,398324801,398324801,67438703311,67438703311,18607359075661,

%U 18607359075661,8942742118054707

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .0.1.1.0.0.1.1.0

%e .1.1.0.0.0.0.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .0.1.1.0.0.1.1.0

%e .0.1.0.0.0.0.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008

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