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%I #3 Nov 19 2015 13:53:11
%S 1,8,149,3741,199456,18120064,1726126592
%N Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 4.
%C Column 3 of A264643.
%e Some solutions for n=4
%e ..4.10..8....2..8..5....4..5..8....9..6..0....4..5..8....1..5..8....1..8..5
%e ..0..7..1....6..0..9....6..9..0....1.10..4....6..9..0....9..6..0....6..0..9
%e ..6..3..9....3..4..1...10..1..7...11..2..8....3..1.10...10..7..4....7..4.10
%e ..2.11..5....7.10.11....3..2.11....3..7..5....7..2.11....3.11..2....3.11..2
%Y Cf. A264643.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 19 2015
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