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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 46 |
| 6 | 9222 |
| 7 | 76449 |
| 8 | 193662 |
| 9 | 2347506 |
| 10 | 2593206 |
| 11 | 17099841 |
| 12 | 17402241 |
| 13 | 25651017 |
| 14 | 32317933 |
| 15 | 16516113567 |
| 16 | 16619231967 |
| 17 | 155784877126 |
| 18 | 2806999337418 |
| 19 | 3101308506654 |
| 20 | 37004798195346 |
| 21 | 47470618709562 |
| 22 | 48517516968462 |