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 horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,5,1,13,13,77,73,597,385,9569,4155,164139,53517,3530729,

%T 1280671,136089779,42489917,6885316541,1853052759,545054905807,

%U 122748998951,61234243905707

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.0.1.0.0

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .1.0.0.0.0.0.0.1

%e .1.1.0.0.0.0.1.1

%e .0.0.1.0.0.1.0.0

%e .0.0.1.1.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008