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 | 105 |
| 2 | 3465 |
| 3 | 45045 |
| 4 | 135135 |
| 5 | 225225 |
| 6 | 405405 |
| 7 | 1576575 |
| 8 | 3648645 |
| 9 | 2297295 |
| 10 | 3828825 |
| 11 | 6891885 |
| 12 | 17342325 |
| 13 | 295540245 |
| 14 | 11486475 |
| 15 | 2659862205 |
| 16 | 26801775 |
| 17 | 62026965 |
| 18 | 225450225 |
| 19 | 43648605 |
| 20 | 215448838605 |
| 21 | 72747675 |
| 22 | 1939039547445 |
| 23 | 130945815 |