A146808 - OEIS

A146808

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1010-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,19,27,613,1233,14815,37647,702665,2068725,127508375,

%T 463231511,59947853247,271601475595,48124416862401,264540648603861,

%U 70632172948864755

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1010-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%e .0.1.1.0.0.1.1.0

%e .0.0.1.0.0.1.0.0

%e .1.0.0.0.0.0.0.1

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008