A146369 - OEIS

A146369

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,3,7,13,21,39,135,491,1711,5531,18851,87961,493635,

%T 2869867,17154745,107225849,792577759,6869876861,66058401395,

%U 676488427499,7479488157903,92053084127249,1298331132850519,20359043284485661

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.0.0.1.0

%e .0.1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1.0

%e .0.1.0.0.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_