A146273 - OEIS

A146273

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,37,73,449,747,5801,13609,176107,460513,50638553,

%T 175114985,12101446061,47558080771,3621711702133,17293036158759,

%U 2644218203849621,14780059508466803,7478633672499919605,51302046629377975419

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_