A147073 - OEIS

A147073

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,3,11,21,39,89,219,569,1579,5069,17101,62347,244493,

%T 1058973,4994427,25066841,137507293,817420471

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.0.1

%e .0.1.0.1.1.1.1.1

%e .0.1.0.1.0.0.0.0

%e .0.1.0.0.0.1.1.0

%e .0.1.1.0.0.0.1.0

%e .0.0.0.0.1.0.1.0

%e .1.1.1.1.1.0.1.0

%e .1.0.0.0.0.0.1.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008