A147017 - OEIS

A147017

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,3,15,21,45,77,277,567,2577,6557,31507,89591,535509,

%T 1822317,13376361,54721945,461666973,2203494951,22033823051

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .1.1.0.1.1.1.1.1

%e .0.1.0.0.1.0.0.0

%e .0.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.0

%e .0.0.0.1.0.0.1.0

%e .1.1.1.1.1.0.1.1

%e .0.1.0.0.0.0.1.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008