login
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.
0

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

%S 1,1,1,1,1,1,13,29,57,123,437,1523,7643,32273,153925,786845,5340469,

%T 36899655,318800081,2591600741,26626203639,272703572385

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.1.0

%e .1.0.0.1.1.1.0.0

%e .1.1.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.1

%e .0.0.0.0.0.0.1.1

%e .0.0.1.1.1.0.0.1

%e .0.1.1.1.1.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008