A147326 - OEIS

A147326

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.

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

%S 1,1,1,1,5,1,9,1,54,15,1010,305,26482,3993,1090248,85931,79078189,

%T 4847983,11622838412,605747926,3166762458310,124132744693,

%U 1523768055043582,41573048881668

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.1.0.0.0.0

%e .0.0.1.1.1.1.1.0.0

%e .0.1.0.0.1.0.0.1.0

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.0.1.0.0.1.0

%e .0.0.1.1.1.1.1.0.0

%e .0.0.0.0.1.0.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_