login
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,3,1,3,5,21,49,187,409,2325,6489,55121,197983,2161765,11768363,

%T 152495079,1086067425,18675930957,164918184657,3873609933855

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.0.1.0

%e .1.1.1.0.1.1.1.0

%e .0.1.1.1.0.1.1.1

%e .0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0

%e .1.1.1.0.1.1.1.0

%e .0.1.1.1.0.1.1.1

%e .0.1.0.0.0.1.0.0

%K nonn

%O 1,4

%A _R. H. Hardin_, Nov 04 2008