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 A264861 #3 Nov 26 2015 20:02:22 %S A264861 1,5,30,839,15000,530302,7041672,211818498,5213013996 %N A264861 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 6 and columns nondecreasing modulo 7. %C A264861 Column 3 of A264862. %e A264861 Some solutions for n=4 %e A264861 ..7..8..2....0..1..9....7..1..3....0..7..8....0..7..8....0..1..9....0..7.10 %e A264861 ..0..1.10....7..8..2....0..8.10....1..9..3....1..2..3....7..8..3....1..2..3 %e A264861 ..9..3.11....3..4.10....2..9..4....2..4.10....9.10..4....2..4.10....8..9..4 %e A264861 ..6..4..5....6..5.11....6..5.11....6.11..5....6..5.11....6.11..5....6.11..5 %Y A264861 Cf. A264862. %K A264861 nonn %O A264861 1,2 %A A264861 _R. H. Hardin_, Nov 26 2015