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%I #3 Nov 17 2015 18:04:25
%S 1,3,15,156,2032,30912,737280,19491840,585019584,26539425792,
%T 1275815411712,65050879721472
%N Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 3.
%C Column 2 of A264560.
%e Some solutions for n=4
%e ..0..7....6..1....6..3....6..3....0..6....0..6....6..4....6..3....0..3....6..3
%e ..6..4....3..7....0..7....0..1....4..3....7..3....3..7....0..1....6..1....0..4
%e ..3..1....0..5....4..1....2..4....5..1....2..4....0..2....4..7....7..5....1..7
%e ..2..5....4..2....2..5....5..7....2..7....5..1....1..5....2..5....4..2....2..5
%Y Cf. A264560.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 17 2015