A146400 - OEIS

A146400

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.

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

%S 1,1,1,1,1,7,21,51,261,1539,11759,111585,1296125,18399415,335874781,

%T 7824897067,229077144211,8419643660275,387472393043501,

%U 22360944601180667

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.1.1.0.1.1

%e .0.0.1.0.1.0.1.0

%e .1.1.1.1.0.1.1.0

%e .1.0.0.0.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_