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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 12 |
| 7 | 15 |
| 8 | 30 |
| 9 | 21 |
| 10 | 168 |
| 11 | 126 |
| 12 | 1260 |
| 13 | 990 |
| 14 | 792 |
| 15 | 1287 |
| 16 | 18018 |
| 17 | 5005 |
| 18 | 80080 |
| 19 | 68068 |
| 20 | 58344 |
| 21 | 50388 |
| 22 | 201552 |
| 23 | 176358 |
| 24 | 3879876 |
| 25 | 3432198 |
| 26 | 27457584 |
| 27 | 24515700 |
| 28 | 637408200 |
| 29 | 573667380 |
| 30 | 16062686640 |
| 31 | 29113619535 |
| 32 | 26466926850 |
| 33 | 24131609775 |