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 180 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.
0

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

%S 1,1,1,1,5,21,61,299,1693,11273,84165,889613,11762051,208288599,

%T 4127254537,109970171123

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .0.0.0.1.1.1.0.1

%e .0.0.0.1.1.0.1.1

%e .0.1.1.0.0.1.1.0

%e .0.1.1.0.0.1.1.0

%e .1.1.0.1.1.0.0.0

%e .1.0.1.1.1.0.0.0

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008