A147431 - OEIS

A147431

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation.

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,3,9,19,43,151,665,3477,19383,122069,922803,8541115,

%T 92856889,1171563865,17291558591,299747161375,6126738372415,

%U 147219368035745,4156365837186519

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.1.0

%e .0.0.0.0.1.1.1.1

%e .0.0.1.1.0.1.0.1

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.0.0.0.0

%e .0.0.0.1.1.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_