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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 30 |
| 5 | 60 |
| 6 | 60 |
| 7 | 60 |
| 8 | 420 |
| 9 | 1260 |
| 10 | 2520 |
| 11 | 2520 |
| 12 | 2520 |
| 13 | 27720 |
| 14 | 27720 |
| 15 | 27720 |
| 16 | 27720 |
| 17 | 27720 |
| 18 | 138600 |
| 19 | 138600 |
| 20 | 138600 |
| 21 | 138600 |
| 22 | 138600 |
| 23 | 138600 |
| 24 | 277200 |
| 25 | 277200 |
| 26 | 277200 |
| 27 | 277200 |
| 28 | 277200 |
| 29 | 277200 |
| 30 | 1940400 |
| 31 | 25225200 |
| 32 | 75675600 |
| 33 | 75675600 |
| 34 | 75675600 |
| 35 | 75675600 |
| 36 | 75675600 |
| 37 | 75675600 |