%I #4 Mar 31 2012 12:35:16
%S 1,1,1,1,1,1,1,3,7,15,31,65,185,517,1673,6585,26113,126591,608081,
%T 3381041,20245821,136182387
%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0001 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.1.0.1.1.0
%e .0.0.0.1.1.1.0.1
%e .0.0.0.1.0.0.1.1
%e .1.1.1.0.0.0.1.0
%e .0.1.0.0.0.1.1.1
%e .1.1.0.0.1.0.0.0
%e .1.0.1.1.1.0.0.0
%e .0.1.1.0.1.0.0.0
%K nonn
%O 1,8
%A _R. H. Hardin_, Nov 04 2008
|