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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 9 |
| 6 | 144 |
| 7 | 145 |
| 8 | 167 |
| 9 | 627 |
| 10 | 2677 |
| 11 | 2725 |
| 12 | 2726 |
| 13 | 12071 |
| 14 | 48652 |
| 15 | 206025 |
| 16 | 63331966 |
| 17 | 307304209 |
| 18 | 1357691960 |