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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 25 |
| 7 | 84 |
| 8 | 397 |
| 9 | 1855 |
| 10 | 9708 |
| 11 | 51684 |
| 12 | 286011 |
| 13 | 1609097 |
| 14 | 9222409 |
| 15 | 53543338 |
| 16 | 314612803 |