A146629 - OEIS

A146629

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,7,21,47,215,1109,8005,71755,717641,8603611,133533027,

%T 2609017895,64328667073,1958813665949,72296633852443,3294639375085767,

%U 187627806470686453

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .1.1.0.0.1.0.1.0

%e .0.1.0.0.0.1.1.1

%e .1.1.1.0.0.0.1.0

%e .0.1.0.1.0.0.1.1

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008