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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 96 |
| 6 | 120 |
| 7 | 480 |
| 8 | 840 |
| 9 | 3360 |
| 10 | 7560 |
| 11 | 30240 |
| 12 | 83160 |
| 13 | 272160 |
| 14 | 332640 |
| 15 | 1081080 |
| 16 | 2993760 |
| 17 | 4324320 |
| 18 | 17297280 |
| 19 | 38918880 |
| 20 | 69189120 |
| 21 | 73513440 |
| 22 | 294053760 |
| 23 | 661620960 |
| 24 | 1176215040 |
| 25 | 1396755360 |
| 26 | 5587021440 |
| 27 | 12570798240 |
| 28 | 22348085760 |
| 29 | 32125373280 |
| 30 | 128501493120 |