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 110-111-001 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,9,9,33,33,113,113,1393,1393,59521,59521,1585365,1585365,

%T 62771429,62771429,6390256297,6390256297,1169289395909,1169289395909

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.1.0.0

%e .1.1.1.0.0.1.1.1

%e .1.1.0.0.0.0.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_