A146189 - OEIS

A146189

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-100 pattern in any orientation.

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,117,259,2279,5789,60955,163861,9576387,34012697,

%T 10076483081,49427387999,9949697912705,60225158985931,

%U 15793067759502057,116501021735138203,110213762112932651169,1030724751585178353123

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .0.1.1.0.0.1.1.0

%e .1.0.0.0.0.0.0.1

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008