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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,1,9,25,37,81,207,659,1525,5011,16955,78955,307577,

%T 1539617,6559267,39653567,197073411,1351045655

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.1.1.0.0.0

%e .0.0.0.1.0.1.1.0.0

%e .0.1.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.0

%e .1.0.0.0.0.0.0.0.1

%e .0.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.1.0

%e .0.0.1.1.0.1.0.0.0

%e .0.0.0.1.1.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_