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 | 9 |
| 2 | 81 |
| 3 | 729 |
| 4 | 5081 |
| 5 | 34173 |
| 6 | 211555 |
| 7 | 1262760 |
| 8 | 7263481 |
| 9 | 40755550 |
| 10 | 223936008 |
| 11 | 1210708628 |
| 12 | 6459502002 |
| 13 | 34095465344 |
| 14 | 178380596163 |
| 15 | 926424208370 |
| 16 | 4781950926795 |
| 17 | 24555731443566 |
| 18 | 125543243787981 |
| 19 | 639444488484051 |