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A147258 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0001-1101-0111 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,1,1,7,13,27,41,105

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0001-1101-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.1.0.0.0

%e .0.0.1.1.0.1.0.0.0

%e .0.1.0.1.1.1.0.0.0

%e .0.1.1.0.0.0.1.1.1

%e .0.0.1.0.0.0.1.0.0

%e .1.1.1.0.0.0.1.1.0

%e .0.0.0.1.1.1.0.1.0

%e .0.0.0.1.0.1.1.0.0

%e .0.0.0.1.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified May 8 15:08 EDT 2024. Contains 372340 sequences. (Running on oeis4.)