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%I #3 Nov 21 2015 07:49:13
%S 1,3,68,1541,37595,1947196,148906136,15063986288
%N Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 4 and columns nondecreasing modulo 5.
%C Row 3 of A264698.
%e Some solutions for n=5
%e ..0.12.10..6.11....0..8..5.10..6....0..1..9..5.10...12..0..5..1.11
%e ..5..9..1..3..7....2.14..7..3.11....6..2.14..3.11....8..6.10..7..3
%e ..8..4.13.14..2...12..4..9.13..1...12..8..4.13..7....4..9.13..2.14
%Y Cf. A264698.
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 21 2015