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 | 5 |
| 4 | 18 |
| 5 | 87 |
| 6 | 422 |
| 7 | 2176 |
| 8 | 11200 |
| 9 | 58231 |
| 10 | 302597 |
| 11 | 1574055 |
| 12 | 8184032 |
| 13 | 42544369 |
| 14 | 221083979 |
| 15 | 1148571336 |
| 16 | 1670519061 |