A146282 - OEIS

A146282

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

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

%S 1,1,1,1,1,1,9,5,29,17,313,37,1657,109,19905,2661,319705,46501,

%T 11762329,480069,357135757,5729689,14191646903,346242155,884769592659,

%U 24356919567

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

%e Maximal 8 X 8 example

%e .1.0.1.0.0.1.0.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%K nonn

%O 1,7

%A _R. H. Hardin_