A146927 - OEIS

A146927

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,3,7,10,30,37,151,202,698,975,4066,6719,38176,61756,

%T 522856,808712,8751773,13746429,162280787,268587501,3757757825,

%U 6472225006,115990561431,202655793135

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008