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 | 15 |
| 2 | 690 |
| 3 | 78135 |
| 4 | 9502354 |
| 5 | 1165032679 |
| 6 | 142937856372 |
| 7 | 17538444837670 |
| 8 | 2151975129988088 |
| 9 | 264048573957784964 |
| 10 | 32398910709148727392 |
| 11 | 3975364904849935772656 |
| 12 | 487779550353892225564624 |