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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01010-11111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,5,1,10,1,26,1,220,25,1716,153,23943,1076,485243,13889,

%T 10665112,185108,364094762,4253039,18497655767,156271576,

%U 1302420306077,7383352471

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 01010-11111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.1.1.1.1.1.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.1.0.1.1.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.1.0.1.1.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.1.1.1.1.1.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008