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 | 30 |
| 2 | 900 |
| 3 | 27000 |
| 4 | 810000 |
| 5 | 24300000 |
| 6 | 729000000 |
| 7 | 21870000000 |
| 8 | 656100000000 |
| 9 | 19683000000000 |
| 10 | 590490000000000 |
| 11 | 17714700000000000 |
| 12 | 531441000000000000 |
| 13 | 15943230000000000000 |
| 14 | 478296900000000000000 |
| 15 | 14348907000000000000000 |
| 16 | 430467210000000000000000 |
| 17 | 12914016300000000000000000 |