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 A264836 #3 Nov 26 2015 07:22:25 %S A264836 1,2,22,271,2703,61692,1521328,77111451,3285347994 %N A264836 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 5 and columns nondecreasing modulo 7. %C A264836 Column 3 of A264837. %e A264836 Some solutions for n=4 %e A264836 ..0..7..9....0..7..8....0..7..2...10..0..9....0..2..7....7..3..8....0..1..7 %e A264836 ..2..8..3...10..1..2....3..8..9...11..7..2....1..3..8....0.11..1....8..4..9 %e A264836 .11..1..4....3..4..9...10..1.11....5..8..3....5.10..9....2..4..9...10.11..2 %e A264836 ..5.10..6....5..6.11....5..6..4....6..1..4....6.11..4...10..5..6....5..6..3 %Y A264836 Cf. A264837. %K A264836 nonn %O A264836 1,2 %A A264836 _R. H. Hardin_, Nov 26 2015