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 A264864 #3 Nov 26 2015 20:03:27 %S A264864 1,5,30,839,16365,550479,8299492,275881482 %N A264864 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 6 and columns nondecreasing modulo 7. %C A264864 Row 3 of A264862. %e A264864 Some solutions for n=4 %e A264864 ..7..8..9.11....0..7..2..8....0..8..9.10....0..1..7..8....7..1..9.10 %e A264864 ..0..1..3..4....1..9..3..4....7..1..2..3....2..3..9.10....0..8..2..4 %e A264864 ..6..2.10..5....6.10.11..5....6..4..5.11....6..4.11..5....6..3..5.11 %Y A264864 Cf. A264862. %K A264864 nonn %O A264864 1,2 %A A264864 _R. H. Hardin_, Nov 26 2015