%I #3 Nov 22 2015 11:03:02

%S 1,3,48,663,23096,1602048,165778944,13350330368

%N Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 4 and columns nondecreasing modulo 6.

%C Row 3 of A264728.

%e Some solutions for n=5

%e .12..0..2.14..6....8.12..0..6..7....0.12.13..1..7....0.12..1..6..2

%e ..8.13..9..5..7....4.13..1..2..3...10..6.14..2..3....8..9.13..7..3

%e ..4..1.10.11..3....5..9.14.10.11....4..8..9..5.11....4..5.10.14.11

%Y Cf. A264728.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 22 2015