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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 1 |
| 7 | 9 |
| 8 | 9 |
| 9 | 15 |
| 10 | 3 |
| 11 | 9 |
| 12 | 3 |
| 13 | 945 |
| 14 | 135 |
| 15 | 27 |
| 16 | 27 |
| 17 | 405 |
| 18 | 45 |
| 19 | 8505 |
| 20 | 1701 |
| 21 | 66825 |
| 22 | 6075 |
| 23 | 18225 |
| 24 | 6075 |
| 25 | 995085 |
| 26 | 76545 |
| 27 | 8505 |
| 28 | 1215 |
| 29 | 18225 |
| 30 | 1215 |
| 31 | 841995 |
| 32 | 841995 |
| 33 | 6506325 |
| 34 | 382725 |
| 35 | 32805 |
| 36 | 3645 |
| 37 | 850797675 |
| 38 | 44778825 |
| 39 | 3444525 |