This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A264658 #3 Nov 20 2015 07:26:37 %S A264658 2,16,314,8944,437568,31791360,3066123264 %N A264658 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 5. %C A264658 Column 3 of A264659. %e A264658 Some solutions for n=5 %e A264658 ..0..5..1....0..7..5....0.11..5....0.11..5....0..1..5....0..2..6....0..2..5 %e A264658 .10..6.11...10.12.11...10.12..1...10..6.13...10..6.12...10.12.11...10.12.11 %e A264658 .12..2..7....6.14..8....8..2..6....7..1..3...11..7..3....5..7.13....6..3..7 %e A264658 .13..3..9....1..9..3....9..3..7...12..2..8....2..9.13....1..3..9....1..9.13 %e A264658 .14..8..4....2..4.13...14..4.13...14..4..9....8..4.14...14..8..4....8..4.14 %Y A264658 Cf. A264659. %K A264658 nonn %O A264658 1,1 %A A264658 _R. H. Hardin_, Nov 20 2015