A147265 - OEIS

A147265

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,5,13,25,47,157,479,1191,4193,22021,114523,544473,

%T 2865365,19090211,131534115

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.1.0.0

%e .0.0.0.0.1.1.1.0.0

%e .0.0.0.1.1.0.0.1.1

%e .0.0.1.0.1.0.0.1.0

%e .0.1.1.1.0.1.1.1.0

%e .0.1.0.0.1.0.1.0.0

%e .1.1.0.0.1.1.0.0.0

%e .0.0.1.1.1.0.0.0.0

%e .0.0.1.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008