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 A264637 #3 Nov 19 2015 07:27:37 %S A264637 2,28,960,46656,4561920,829440000,218972160000,73903104000000 %N A264637 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4. %C A264637 Column 3 of A264638. %e A264637 Some solutions for n=4 %e A264637 ..8..0..9....8..4..0....4..8..0....4.10..9....0..4..8....0..4..9....2..8..4 %e A264637 ..6..4..1...10..5..9...10..6..1....0..6..5....6..1..5...10..8..5...10..0..5 %e A264637 .10..2..5....2..6..1....2..3..9....8..2..1....2..9..7....2..7..1....6.11..1 %e A264637 ..3.11..7....7..3.11...11..7..5....3..7.11...10.11..3....6.11..3....3..7..9 %Y A264637 Cf. A264638. %K A264637 nonn %O A264637 1,1 %A A264637 _R. H. Hardin_, Nov 19 2015