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 | 1 |
| 1 | 3 |
| 2 | 30 |
| 3 | 294 |
| 4 | 4599 |
| 5 | 81081 |
| 6 | 1837836 |
| 7 | 47609100 |
| 8 | 1449052605 |
| 9 | 49597258095 |
| 10 | 1908702935370 |
| 11 | 81045039516210 |
| 12 | 3775424041048275 |
| 13 | 191061229964098725 |
| 14 | 10445176764205306200 |
| 15 | 613084928455370309400 |
| 16 | 38459158233446064893625 |
| 17 | 2567221442902306374982875 |