A146857 - OEIS

A146857

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,17,17,49,49,249,249,3481,3481,80333,80333,1943801,

%T 1943801,59816323,59816323

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 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 .1.1.1.0.0.0.1.1.1

%e .1.0.1.1.0.1.1.0.1

%e .0.0.0.0.0.0.0.0.0

%e .1.0.1.1.0.1.1.0.1

%e .1.1.1.0.0.0.1.1.1

%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_, Nov 04 2008