A146744 - OEIS

A146744

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

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

%S 1,1,1,1,17,29,123,759,4287,32985,430679,4420973,81497997,1458257461,

%T 41635242773

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008