A146929 - OEIS

A146929

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-1001 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,1,2,4,7,11,16,28,59,128,309,746,1962,5226,15414,

%T 47005,157387,544191,2059429,7980929,34126004,149438343,727180335

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111-1001 pattern in any orientation.

%e Maximal 10 X 10 example

%e .0.0.0.1.0.0.1.0.0.0

%e .0.0.0.1.1.1.1.0.0.0

%e .0.0.0.1.0.0.1.0.0.0

%e .1.1.1.0.0.0.0.1.1.1

%e .0.1.0.0.0.0.0.0.1.0

%e .1.1.1.0.0.0.0.1.1.1

%e .0.0.0.1.0.0.1.0.0.0

%e .0.0.0.1.1.1.1.0.0.0

%e .0.0.0.1.0.0.1.0.0.0

%K nonn

%O 1,10

%A _R. H. Hardin_, Nov 04 2008