A146426 - OEIS

A146426

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,1,1,1,3,3,13,13,35,35,165,165,727,727,4597,4597,49361,

%T 49361

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.0.0.1.0.1.0.0.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%e .1.0.1.0.1.0.1.0.1.0.1

%e .1.1.1.1.0.0.0.1.1.1.1

%e .0.0.0.0.0.0.0.0.0.0.0

%e .1.1.1.1.0.0.0.1.1.1.1

%e .1.0.1.0.1.0.1.0.1.0.1

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.0.0.1.0.1.0.0.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_