A146255 - OEIS

A146255

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.

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

%S 1,1,3,1,5,9,27,79,359,979,7545,28031,289781,1662565,22704081,

%T 184816617,3459666973,37715425193,1006494628185,14994761556409,

%U 556041103278131,11700677821513253

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .0.0.0.0.1.1.1.0

%e .0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0

%e .0.1.1.1.0.0.0.0

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,3

%A _R. H. Hardin_