A147341 - OEIS

A147341

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

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

%S 1,1,1,1,1,1,3,9,19,39,125,481,2209,12179,71971

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.1.0.0

%e .0.0.0.0.1.1.1.1

%e .0.0.0.1.0.0.1.0

%e .0.1.1.1.0.0.1.0

%e .0.0.0.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_