A146245 - OEIS

A146245

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation.

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

%S 1,1,1,1,1,1,3,3,5,5,11,11,29,29,171,171,783,783,4399,4399,33371,

%T 33371,348951,348951,4490023,4490023,67743969,67743969,1262306965,

%U 1262306965

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .1.1.0.0.0.0.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_