A146172 - OEIS

A146172

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-100-111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,117,259,1991,4759,52453,136907,6546215,22604681,

%T 6955049615,33225401665,5312086374693,30690294218759,6137053540967147,

%U 42562920511505493,35203573251917171119,310505729227048458909

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-100-111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.1.0.0.1.0.0

%e .1.0.1.0.0.1.0.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008