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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 15 |
| 4 | 210 |
| 5 | 703 |
| 6 | 20895 |
| 7 | 239263 |
| 8 | 4497567 |
| 9 | 28203751 |
| 10 | 2222250495 |
| 11 | 103612115103 |