A147071 - OEIS

A147071

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,1,1,3,5,11,17,33,69,195,461,1581,4385,16401,52739,

%T 234041,877033,4605425,20357297,124937647

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.

%e Maximal 10 X 10 example

%e .0.0.0.0.0.0.0.1.0.0

%e .0.0.0.1.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.0.1.1

%e .0.1.1.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.1.1.0

%e .1.1.0.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.1.0.0.0

%e .0.0.1.0.0.0.0.0.0.0

%K nonn

%O 1,10

%A _R. H. Hardin_, Nov 04 2008