A146231 - OEIS

A146231

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,5,17,35,163,959,6943,61513,740733,9820359,193942865,4360418313,

%T 137513801459

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.1.1.1.1

%e .1.1.1.1.0.0.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.1.1.1.1

%e .1.1.1.1.0.0.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.1.1.1.1

%e .1.1.1.1.0.0.1.1

%K nonn

%O 1,4

%A _R. H. Hardin_