A147234 - OEIS

A147234

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.

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

%S 1,1,1,1,3,7,19,49,195,1111,7177,51609,452845,5123643,72369101,

%T 1214915609,24818665423,626087799933,19508645488885,741333829643879

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.0.0.0

%e .0.0.0.1.0.0.0.1

%e .1.0.0.1.1.0.1.1

%e .1.1.1.0.1.0.1.0

%e .1.0.1.1.0.1.1.1

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.1.0.1.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008