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A146375 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,1,21,9,201,25,1634,125,22896,1331,494897,18779,

%T 18283376,389231,1000392247,11969301,84124514832,573650431,

%U 10424120801341,41782304071,1874244968782308,4475707668912

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.1.0.0.1.0.0.1.0

%e .1.1.1.0.1.0.1.1.1

%e .0.1.0.1.1.1.0.1.0

%e .0.1.0.0.1.0.0.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.0.1.0.0.1.0

%e .0.1.0.1.1.1.0.1.0

%e .1.1.1.0.1.0.1.1.1

%e .0.1.0.0.1.0.0.1.0

%K nonn

%O 1,9

%A _R. H. Hardin_

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Last modified February 24 01:05 EST 2024. Contains 370288 sequences. (Running on oeis4.)