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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-01000 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,1,3,5,11,17,29,49,194,513,1943,5111,18756,56573,304185,

%T 1238797,7708601,34648607,235404133,1230092163,10469480011,68020491883

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-01000 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.1.0.0

%e .0.1.0.0.0.1.0.1.0

%e .0.1.0.0.0.0.1.1.1

%e .0.1.0.0.0.0.0.1.0

%e .1.1.1.0.0.0.0.1.0

%e .0.1.0.1.0.0.0.1.0

%e .0.0.1.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008