A146865 - OEIS

A146865

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-1111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,25,25,193,193,1061,1061,19265,19265,384413,384413,

%T 13738057,13738057,820631045,820631045

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-1111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .1.1.0.1.0.1.0.1.1

%e .1.1.1.1.0.1.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.1.0.1.1.1.1

%e .1.1.0.1.0.1.0.1.1

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008