%I
%S 1,0,2,44,1949,119544,9966710,1094087602,153634294614,26915214507240,
%T 5760519575052132,1479878539858828536
%N Number of nX2 arrays containing 2 copies of 0..n1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A267072.
%e Some solutions for n=4
%e ..0..0....0..3....0..3....0..2....0..2....0..3....0..2....0..2....0..2....0..3
%e ..2..2....0..2....3..2....0..2....0..2....1..1....0..3....3..1....3..1....0..2
%e ..3..1....2..1....2..1....3..3....3..1....2..2....1..1....3..1....1..3....3..1
%e ..1..3....3..1....1..0....1..1....1..3....0..3....3..2....2..0....0..2....2..1
%Y Cf. A267072.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 10 2016
