A146710 - OEIS

A146710

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

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

%S 1,1,1,1,1,1,1,3,9,19,33,61,193,825,3483,14075,51829,241741,1419559,

%T 10170199,74039549,568610375,4513545321

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

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.0.1.0.1.1

%e .0.1.0.0.0.1.1.1

%e .1.1.1.0.0.0.1.0

%e .1.1.0.1.0.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.1.1.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008