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%I #5 Aug 12 2016 07:04:21
%S 1,1,5,101,3417,184881,14216101,1477674733,199405047857,
%T 33889007175041,7081268215880805,1784184251089927605
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A266455.
%e Some solutions for n=4
%e ..0..1....0..0....0..2....0..3....0..3....0..3....0..2....0..3....0..2....0..1
%e ..2..3....3..3....2..0....0..3....2..3....0..1....3..0....2..3....2..1....3..1
%e ..0..1....1..2....1..3....2..1....2..1....2..1....1..3....1..2....1..3....2..3
%e ..2..3....1..2....3..1....2..1....1..0....2..3....1..2....0..1....0..3....0..2
%Y Cf. A266455.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 29 2015