A147204 - OEIS

A147204

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.

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

%S 1,1,1,1,1,5,17,37,97,589,4299,27851,193127,2080835,29286959,

%T 452848509,7844143081,177658806371,5163186936815,177926288939305

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0101-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.1.0

%e .0.0.0.0.1.0.1.0

%e .0.0.0.1.1.0.0.0

%e .0.0.1.0.0.0.0.0

%e .1.1.1.0.0.0.0.0

%e .1.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008