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A146803 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,1,3,9,19,33,63,179,631,2615,10639,41433,178083,913809,

%T 5548581,37539533,271244083

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.0.0

%e .0.0.1.1.0.0.0.0

%e .0.1.0.1.1.0.0.1

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .1.0.0.1.1.0.1.0

%e .0.0.0.0.1.1.0.0

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008

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Last modified January 25 14:14 EST 2022. Contains 350572 sequences. (Running on oeis4.)