A147371 - OEIS

A147371

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

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

%S 1,1,1,1,1,3,9,19,42,149,642,3217,16918,103595,764774,6743975,

%T 68369223,809162389,11357687762,186710566988,3547308633892,

%U 78610913689329,2049663760103557,62999437730030008

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

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.1.1.0

%e .0.0.0.0.0.0.1.1

%e .0.0.0.0.1.1.1.0

%e .0.1.0.1.0.0.0.0

%e .0.1.1.1.0.0.0.0

%e .0.0.1.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_