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%I #3 Nov 21 2015 08:05:25
%S 1,3,6,36,288,2240,20736,264384,2892672,63452160,1528823808,
%T 36691771392,941182156800,29143203840000,803229696000000,
%U 36978425856000000
%N Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.
%C Column 2 of A264704.
%e Some solutions for n=7
%e ..6..0....0..1....6..7....0..7...12..7...12..7....6..0...12..1....6..0....6.12
%e .12..7...12..2...12..1...12.13....0..1....0..1...12.13....6.13...12.13....0..7
%e .13..9....6..8....0.13....6..2....6.13....6..9....3..1....0..7....1..9...13..1
%e ..1..3....7..9....2..8....1..3....8..9...13..3....9..7....2..9....7..3....8..3
%e ..2..4...13..3....4..3....8..9....2..3....2..4....4..2....8.10....8..4....2..4
%e ..8.10....4.11...10..9....4.10...10..4....8.10...10..8....3..5....2..5....9..5
%e ..5.11...10..5....5.11...11..5....5.11....5.11...11..5....4.11...10.11...10.11
%Y Cf. A264704.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 21 2015
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