A147287 - OEIS

A147287

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,25,41,113,265,1045,2597,10607,34895,213407,913033,

%T 6860785,33581603

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.0.0.0.0.0.1.1

%e .1.1.0.0.0.1.1.1.0

%e .0.1.0.0.0.1.0.0.0

%e .0.1.1.1.0.1.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.1.0.1.1.1.0

%e .0.0.0.1.0.0.0.1.0

%e .0.1.1.1.0.0.0.1.1

%e .1.1.0.0.0.0.0.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008