A147102 - OEIS

A147102

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,3,7,15,33,93,429,2069,10289,55429,387995,3482253,35863559,

%T 411870399,5523860439,89237334993,1723598801687,38814880673445,

%U 1022726070574065

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.1.0.0.0.1

%e .1.1.0.0.0.0.0.1

%e .1.0.0.0.0.0.1.1

%e .1.0.0.0.1.1.1.0

%e .0.0.0.1.0.0.0.1

%e .0.0.1.1.0.0.1.1

%e .1.1.1.0.1.1.1.0

%K nonn

%O 1,4

%A _R. H. Hardin_, Nov 04 2008