A146842 - OEIS

A146842

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111-1000 pattern in any orientation.

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

%S 1,1,1,1,1,3,13,31,85,391,2235,16087,124573,1136363,12958205,

%T 185857105,3266797811,68594033643,1733074438523,53263262779599,

%U 1999938243860711

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111-1000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.1

%e .0.0.0.0.1.1.1.1

%e .0.0.1.1.0.0.0.1

%e .0.0.0.1.0.0.0.0

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008