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 | 9 |
| 3 | 100 |
| 4 | 1089 |
| 5 | 11881 |
| 6 | 129600 |
| 7 | 1413721 |
| 8 | 15421329 |
| 9 | 168220900 |
| 10 | 1835008569 |
| 11 | 20016873361 |
| 12 | 218350598400 |
| 13 | 2381839709041 |
| 14 | 25981886201049 |
| 15 | 283418908502500 |
| 16 | 3091626107326449 |
| 17 | 33724468272088441 |
| 18 | 367877524885646400 |