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 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 11 |
| 7 | 19 |
| 8 | 37 |
| 9 | 83 |
| 10 | 223 |
| 11 | 739 |
| 12 | 3181 |
| 13 | 18911 |
| 14 | 166679 |
| 15 | 2376391 |
| 16 | 60953117 |
| 17 | 3202432763 |
| 18 | 403823050201 |