A147168 - OEIS

A147168

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation.

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

%S 1,1,1,1,1,1,3,13,37,67,147,499,1519,5231,22885,101333,548323,3012179,

%T 18194005,121163279,875290875

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1101-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.1.1.1

%e .1.0.0.0.1.1.0.1

%e .1.1.0.0.1.0.0.0

%e .0.1.1.0.0.0.0.0

%e .0.0.0.0.0.1.1.0

%e .0.0.0.1.0.0.1.1

%e .1.0.1.1.0.0.0.1

%e .1.1.1.0.0.0.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008