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 | 15 |
| 3 | 315 |
| 4 | 2145 |
| 5 | 3465 |
| 6 | 17325 |
| 7 | 45045 |
| 8 | 51975 |
| 9 | 225225 |
| 10 | 405405 |
| 11 | 315315 |
| 12 | 765765 |
| 13 | 1576575 |
| 14 | 2297295 |