A147485 - OEIS

A147485

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,2,3,5,7,13,19,54,129,405,1014,3416,8953,35203,121647,

%T 602370,2444491,14100721,64488491,418264276,2289523483

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11011-01110-00100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.1.1.0

%e .0.0.0.1.1.1.0.1

%e .1.0.0.0.1.0.1.1

%e .1.1.0.0.0.1.1.0

%e .0.1.1.0.0.0.1.1

%e .1.1.0.1.0.0.0.1

%e .1.0.1.1.1.0.0.0

%e .0.1.1.0.1.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_