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 A264703 #3 Nov 21 2015 08:05:49 %S A264703 2,15,296,9024,492480,30233088,3589152768,470304423936,94978179072000 %N A264703 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6. %C A264703 Column 3 of A264704. %e A264703 Some solutions for n=4 %e A264703 ..6..0..9....8..6..0....6..0..1....2..6..1....0..8.10....2..0..6....0..9..7 %e A264703 ..8..1..3....2..7..1....7..9..3...10..0..7....6..2..4....8..1..3....6..4..1 %e A264703 ..4..7..5....4..3..5....8.10..5....4..8..3....1..9.11...10..7..5....2.10..3 %e A264703 .10..2.11...10..9.11....2..4.11...11..5..9....7..3..5....4..9.11....8..5.11 %Y A264703 Cf. A264704. %K A264703 nonn %O A264703 1,1 %A A264703 _R. H. Hardin_, Nov 21 2015