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 | 36 |
| 7 | 10 |
| 8 | 60 |
| 9 | 21 |
| 10 | 157080 |
| 11 | 36 |
| 12 | 2394591020640 |
| 13 | 330 |
| 14 | 438900 |
| 15 | 702 |
| 16 | 185640 |
| 17 | 105 |
| 18 | 392201962392240 |
| 19 | 680 |
| 20 | 47347883887966200 |
| 21 | 450574740 |
| 22 | 3183089069160 |
| 23 | 210 |