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%I #5 Aug 12 2016 07:04:21
%S 1,1,5,74,2668,150836,12011058,1279437414,175836809388,30308775142980,
%T 6404886614932128
%N Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its northwest or southwest neighbor modulo n and the upper left element equal to 0.
%C Column 2 of A266572.
%e Some solutions for n=6
%e ..0..4....0..3....0..1....0..3....0..4....0..1....0..0....0..1....0..3....0..1
%e ..2..2....1..4....5..2....0..5....2..5....5..0....4..5....5..3....0..4....5..3
%e ..5..0....1..5....4..3....2..2....0..1....4..4....2..1....3..1....5..4....4..2
%e ..3..3....2..4....5..4....4..5....3..4....5..3....3..4....4..0....2..1....5..3
%e ..1..1....0..5....2..3....3..4....2..3....3..2....5..2....2..4....5..1....0..1
%e ..5..4....2..3....0..1....1..1....5..1....2..1....3..1....2..5....3..2....2..4
%Y Cf. A266572.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 01 2016
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