A147090 - OEIS

A147090

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10001-11111 pattern in any orientation.

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

%S 1,1,1,1,5,13,25,51,215,1059,6091,34649,217439,1714483,16064320,

%T 187492557

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10001-11111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.1.1.1.1.1

%e .1.0.0.1.0.0.0.1

%e .1.0.0.0.0.0.0.0

%e .1.0.0.0.0.0.1.1

%e .1.1.0.0.0.0.0.1

%e .0.0.0.0.0.0.0.1

%e .1.0.0.0.1.0.0.1

%e .1.1.1.1.1.0.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008