A147484 - OEIS

A147484

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

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

%S 1,1,1,1,1,3,8,23,63,191,685,3493,20460,144341,1163965,10657560,

%T 110643922,1393408349,20934516013,373325933993,7839237276478,

%U 192639728351279,5496880042565859

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.1.1.0.0

%e .1.0.1.1.1.0.0.0

%e .1.1.0.1.0.0.0.1

%e .0.1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1.0

%e .1.0.0.0.1.0.1.1

%e .0.0.0.1.1.1.0.1

%e .0.0.1.1.0.1.1.0

%K nonn

%O 1,6

%A _R. H. Hardin_