login
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.
0

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

%S 1,1,1,1,1,1,1,1,57,101,643,1213,11025,24069,404103,1045647,63992333,

%T 202749207,15427634943,58155611415,5752715311031,25613170526609,

%U 4354577724343601,22986304172716415,7655445641728562265

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.1.0.0.0.0.0.1.0

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.1.0

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.0.0.0.0.1.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008