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%I #3 Nov 19 2015 07:29:43
%S 1,16,960,107568,21565440,10027929600,7163873280000
%N Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.
%C Row 3 of A264638.
%e Some solutions for n=4
%e ..0..4..6..8....8..6..0..1....4..2..8..1....8..4..9..1....0..8..5..1
%e ..2..1.11..9....4..2..5..9....0..6.10..9....0..6.10..5....4..6.10..9
%e .10..5..3..7...10..7.11..3...11..3..7..5....2..7.11..3....2..7.11..3
%Y Cf. A264638.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 19 2015
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