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 | 21 |
| 3 | 1210 |
| 4 | 239580 |
| 5 | 242621698 |
| 6 | 1084282319384 |
| 7 | 23180312098708413 |
| 8 | 2169349966829797899136 |