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 A264708 #3 Nov 21 2015 08:19:44 %S A264708 1,8,152,4544,202176,10964160,1200365568,150015836160,27805483008000 %N A264708 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 6. %C A264708 Column 3 of A264709. %e A264708 Some solutions for n=4 %e A264708 ..0..6..2....9..0..6....0..6..7....6..7.10....9..6..7....6..0..7....3..6..0 %e A264708 ..3..7..8....3..1..2....1..8..2....0..1..4....3..0..2....1..8..2....9..1..7 %e A264708 ..9..1..4....4..7.10....3..9.11....8..2..5....4..1.10....9..3.11...10..2..8 %e A264708 .10..5.11....5..8.11....4.10..5....9..3.11...11..8..5...10..4..5....4..5.11 %Y A264708 Cf. A264709. %K A264708 nonn %O A264708 1,2 %A A264708 _R. H. Hardin_, Nov 21 2015