A147357 - OEIS

A147357

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,2,3,8,13,22,45,113,275,994,2604,9935,31457,134870,

%T 529162,2763867,12621629,78239209,410491794,3050461822

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.1.0.0.0

%e .1.0.0.1.1.0.0.1

%e .1.1.1.0.0.1.1.1

%e .1.0.0.1.1.0.0.1

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.1.1.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_