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 | 6 |
| 5 | 19 |
| 6 | 78 |
| 7 | 345 |
| 8 | 1780 |
| 9 | 10030 |
| 10 | 62602 |
| 11 | 429607 |
| 12 | 3285435 |
| 13 | 28623679 |
| 14 | 296580989 |
| 15 | 3897603006 |