A146277 - OEIS

A146277

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

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

%S 1,1,1,1,1,1,3,3,5,5,9,9,21,21,93,93,381,381,1551,1551,7459,7459,

%T 56347,56347,473995,473995,4321181

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

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .1.1.0.0.0.0.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_