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 A264694 #3 Nov 21 2015 07:31:56 %S A264694 1,6,80,3196,171962,17647792,2685878592 %N A264694 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 5. %C A264694 Row 3 of A264692. %e A264694 Some solutions for n=5 %e A264694 ..0.10.11..8..5....0..6.11..8..5....3.10..2..5.11....0..3.12..1.10 %e A264694 ..3..6.12.13..2...10..1..7.14..2....9..0.12..6..1....6..9.13..2..5 %e A264694 ..9..1..7..4.14....9.12..3..4.13....4..7.13..8.14....7..4..8.14.11 %Y A264694 Cf. A264692. %K A264694 nonn %O A264694 1,2 %A A264694 _R. H. Hardin_, Nov 21 2015