A147492 - OEIS

A147492

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11101-10111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,5,13,29,115,371,1127,6493,42101,265099,2205911,20203737,

%T 188160663,2232930361,31949821401,512095816829,9852484817887,

%U 220067190717237

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11101-10111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.1.1

%e .0.0.0.0.0.0.0.1

%e .0.0.0.0.0.0.1.1

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.1.1

%e .0.1.0.1.1.1.0.0

%e .0.1.1.1.0.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_