A146652 - OEIS

A146652

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,17,17,57,57,265,265,2569,2569,62981,62981,1534149,

%T 1534149,39874393,39874393

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.0.0.0.0.0.0.1

%e .1.1.1.0.0.0.1.1.1

%e .1.0.1.0.0.0.1.0.1

%e .0.0.0.0.0.0.0.0.0

%e .1.0.1.0.0.0.1.0.1

%e .1.1.1.0.0.0.1.1.1

%e .1.0.0.0.0.0.0.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008