A146415 - OEIS

A146415

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-1000 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,18,9,192,29,1571,137,16589,1117,263101,13601,7736259,

%T 257342,336101213,6436423,19847949792,229848194

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-1000 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.1.0.1.1.1.0.1.0

%e .0.1.0.0.1.0.0.1.0

%e .1.1.1.0.1.0.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.0.1.0.1.1.1

%e .0.1.0.0.1.0.0.1.0

%e .0.1.0.1.1.1.0.1.0

%K nonn

%O 1,9

%A _R. H. Hardin_