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 A264727 #5 May 28 2021 13:16:52 %S A264727 1,4,48,474,11552,460672,29777920,1502334976,122494021632 %N A264727 Number of n X 3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 4 and columns nondecreasing modulo 6. %C A264727 Column 3 of A264728. %e A264727 Some solutions for n=5 %e A264727 .12..0..1...12..1..6....0.12.13...12.13..7....0.13..7...12.13..1...12..6..7 %e A264727 .13..6..7....0.13..9...14..6..7....6..2.14....6.14..2....6.14..7....0..9.13 %e A264727 ..8.10..2....2..7..3....9..1..3....0..8.10...12..9..3....0..9..3....1.10.14 %e A264727 .14.11..3...14.10.11....4..8.10....1..9..5....1.10.11....8..4..5....8..4..2 %e A264727 ..4..5..9....8..4..5....5..2.11....4..3.11....8..4..5....2.10.11....5.11..3 %Y A264727 Cf. A264728. %K A264727 nonn %O A264727 1,2 %A A264727 _R. H. Hardin_, Nov 22 2015