A146572 - OEIS

A146572

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

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,1,17,17,57,57,369,369,6075,6075,152201,152201,4520107,

%T 4520107,199476793,199476793,15394540581

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

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.1.1.1.0.1.1.1.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.1.1.1.0.1.1.1.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008