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 | 2 |
| 3 | 7 |
| 4 | 25 |
| 5 | 99 |
| 6 | 416 |
| 7 | 1854 |
| 8 | 8411 |
| 9 | 38980 |
| 10 | 182829 |
| 11 | 867096 |
| 12 | 4145168 |
| 13 | 19955321 |
| 14 | 96619260 |
| 15 | 470157772 |