A147373 - OEIS

A147373

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,2,1,4,1,8,3,22,9,79,19,256,42,946,149,4545,642,27699,

%T 3217

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .1.1.1.0.1.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.1.0.1.1.1

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_