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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 15 |
| 6 | 58 |
| 7 | 272 |
| 8 | 1614 |
| 9 | 11911 |
| 10 | 109539 |
| 11 | 1247691 |
| 12 | 17566431 |
| 13 | 305310547 |
| 14 | 6558690953 |
| 15 | 174688164414 |