A147191 - OEIS

A147191

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,3,11,21,45,95,317,775,2631,8089,34521,128479,651913,

%T 2804553,16941209,86096205,609652687

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.0.1.1

%e .1.1.0.0.1.1.1.0

%e .0.1.0.1.1.0.0.0

%e .0.1.1.0.0.1.0.0

%e .0.0.1.0.0.1.1.0

%e .0.0.0.1.1.0.1.0

%e .0.1.1.1.0.0.1.1

%e .1.1.0.0.0.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008