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 | 8 |
| 2 | 89 |
| 3 | 987 |
| 4 | 10946 |
| 5 | 121393 |
| 6 | 1346269 |
| 7 | 14930352 |
| 8 | 165580141 |
| 9 | 1836311903 |
| 10 | 20365011074 |
| 11 | 225851433717 |
| 12 | 2504730781961 |
| 13 | 27777890035288 |
| 14 | 308061521170129 |
| 15 | 3416454622906707 |
| 16 | 37889062373143906 |
| 17 | 420196140727489673 |
| 18 | 4660046610375530309 |
| 19 | 51680708854858323072 |
| 20 | 573147844013817084101 |
| 21 | 6356306993006846248183 |