A147322 - OEIS

A147322

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,1,1,2,3,5,9,15,23,50,117,289,741,2046,5466,16079,52199,

%T 188773,719705,3000618

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.1.1.1.1.1.0.0

%e .0.0.0.0.1.0.0.0.0

%e .1.0.0.0.1.0.0.0.1

%e .1.1.1.1.0.1.1.1.1

%e .1.0.0.0.1.0.0.0.1

%e .0.0.0.0.1.0.0.0.0

%e .0.0.1.1.1.1.1.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_