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 | 9 |
| 2 | 99 |
| 3 | 1218 |
| 4 | 16065 |
| 5 | 222138 |
| 6 | 3178140 |
| 7 | 46656324 |
| 8 | 698868216 |
| 9 | 10639125640 |
| 10 | 164128169205 |
| 11 | 2560224004884 |
| 12 | 40314178429707 |
| 13 | 639948824981928 |
| 14 | 10230035192533800 |
| 15 | 164541833894991240 |
| 16 | 2660919275605834701 |
| 17 | 43239781879996449825 |
| 18 | 705687913212419321800 |
| 19 | 11561996402992103418000 |
| 20 | 190100812111989146008641 |