A146617 - OEIS

A146617

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation.

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

%S 1,1,1,1,5,21,57,285,1551,8309,69683,754867,9884801,158671845,

%T 3311072917,81046423259

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0110 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.1.1.0.0

%e .1.1.0.1.1.0.0.0

%e .0.1.1.0.1.0.0.0

%e .0.0.0.1.0.1.1.0

%e .0.0.0.1.1.0.1.1

%e .0.0.1.1.0.0.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008