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 A264697 #3 Nov 21 2015 07:48:05 %S A264697 1,5,68,1378,26662,975419,54443028,4147768144 %N A264697 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 4 and columns nondecreasing modulo 5. %C A264697 Column 3 of A264698. %e A264697 Some solutions for n=5 %e A264697 .12..5.10....5..6.10...10.11..7....5..7.11....0..6.10....5..6.10....0..1.10 %e A264697 ..8..0..6....0.11..7....5..1..2....0..8..1....1.13..5....0..8..1....5..6.11 %e A264697 .13.11..7...12..1..2....0..8.12...10.14..6....7..3.11....2..3.11....8.12..2 %e A264697 ..9..1..3....4..8..3....6.14..3...12..4..2...12..9..2...12.13..7....4..7..3 %e A264697 ..4..2.14....9.13.14....4..9.13...13..9..3....8..4.14....4..9.14....9.13.14 %Y A264697 Cf. A264698. %K A264697 nonn %O A264697 1,2 %A A264697 _R. H. Hardin_, Nov 21 2015