A146226 - OEIS

A146226

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,29,29,221,221,2091,2091,47147,47147,1321607,1321607,

%T 74618535,74618535,6202582309,6202582309

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.1.1.0.1.1.0.1

%e .1.1.0.1.0.1.0.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.0.1.0.1.0.1.1

%e .1.0.1.1.0.1.1.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_