A146367 - OEIS

A146367

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,9,9,25,25,125,125,1323,1323,18755,18755,388143,

%T 388143,11998517,11998517,573092271,573092271,41661958269,41661958269,

%U 4471274578309,4471274578309,730746269407465

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0010 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.0.0.0.1.0.0

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.1.0

%e .1.1.1.1.0.1.1.1.1

%e .0.0.1.0.0.0.1.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_