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 | 3 |
| 4 | 17 |
| 5 | 140 |
| 6 | 990 |
| 7 | 1887 |
| 8 | 3530 |
| 9 | 5996 |
| 10 | 13820 |
| 11 | 21873 |
| 12 | 26045 |
| 13 | 87720 |
| 14 | 232599 |
| 15 | 480684 |
| 16 | 538640 |