A146605 - OEIS

A146605

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.

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

%S 1,1,1,1,1,3,9,19,59,237,1193,6925,46535,385115,3834729,46129325,

%T 665267927,11525172145,240724568637,6036636466243,182136263500283,

%U 6609883325424453

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.0.0.1.0.0.0

%e .1.0.0.0.1.1.0.0

%e .1.1.1.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008