A146732 - OEIS

A146732

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,17,17,49,49,253,253,4269,4269,109305,109305,2719409,

%T 2719409,106590781,106590781

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.1.0

%e .0.1.1.1.0.1.1.1.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.1.1.1.0.1.1.1.0

%e .0.1.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008