A146458 - OEIS

A146458

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,1,1,3,3,11,11,31,31,113,113,699,699,5221,5221,45431,

%T 45431,522967

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.1.0.0.0.1.0.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.1.0.1.1.0.1.1.0.1.0

%e .1.1.1.0.1.0.1.0.1.1.1

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.0.0.0.0.0.0.0.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .1.1.1.0.1.0.1.0.1.1.1

%e .0.1.0.1.1.0.1.1.0.1.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.0.1.0.0.0.1.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_