login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,17,41,75,189,781,2423,8297,41313,246219,1447691,

%T 8722011,58593249,472152107,3875447631

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.0.1.1

%e .1.1.1.0.0.0.1.0

%e .0.0.1.0.1.1.1.0

%e .0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0

%e .0.1.1.1.0.1.0.0

%e .0.1.0.0.0.1.1.1

%e .1.1.0.0.0.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_