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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 52 |
| 5 | 125 |
| 6 | 1806 |
| 7 | 5047 |
| 8 | 87368 |
| 9 | 544329 |
| 10 | 7408810 |
| 11 | 39916811 |
| 12 | 1281329292 |
| 13 | 6227020813 |
| 14 | 174477663374 |
| 15 | 2015997984015 |
| 16 | 45336862771216 |
| 17 | 355687428096017 |
| 18 | 16059446167564818 |
| 19 | 121645100408832019 |
| 20 | 5372665305815808020 |
| 21 | 76707372899469312021 |
| 22 | 2248001765299683993622 |