A147461 - OEIS

A147461

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.

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

%S 1,1,1,1,1,1,9,11,153,277,1847,3941,42907,102189,2677867,7544909,

%T 418620919,1424570893,112979816299,454603733387,48372707337627,

%U 228790897270887,42082899027578731,234640059600540451

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.1.1.0.0.1.1.0

%e .1.1.0.0.0.0.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_