login
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:13

%S 1,1,1,1,1,1,3,5,11,21,39,105,351,1205,4629,16631,70563,335933,

%T 1961161,12194507,84627809,599408761

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.1.0

%e .0.0.0.1.1.0.0.1

%e .0.0.0.0.1.0.0.1

%e .1.1.0.0.0.1.1.1

%e .1.1.1.0.0.0.1.1

%e .1.0.0.1.0.0.0.0

%e .1.0.0.1.1.0.0.0

%e .0.1.1.1.1.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008