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) |
|---|---|
| 2 | 2 |
| 3 | 10 |
| 4 | 62 |
| 5 | 466 |
| 6 | 4142 |
| 7 | 42610 |
| 8 | 498542 |
| 9 | 6541426 |
| 10 | 95160302 |
| 11 | 1520385010 |
| 12 | 26468935022 |
| 13 | 498766780786 |
| 14 | 10114484622062 |
| 15 | 219641848007410 |
| 16 | 5085371491003502 |
| 17 | 125055112347154546 |
| 18 | 3255163896227709422 |
| 19 | 89416052656071565810 |
| 20 | 2584886208925055791982 |
| 21 | 78447137202259689678706 |
| 22 | 2493719594804686310662382 |