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 | 2 |
| 1 | 4 |
| 2 | 9 |
| 3 | 24 |
| 4 | 81 |
| 5 | 358 |
| 6 | 2021 |
| 7 | 13828 |
| 8 | 109857 |
| 9 | 986922 |
| 10 | 9865125 |
| 11 | 108507160 |
| 12 | 1302065441 |
| 13 | 16926805678 |
| 14 | 236975181189 |
| 15 | 3554627504844 |
| 16 | 56874039618753 |
| 17 | 966858672535762 |
| 18 | 17403456103546565 |
| 19 | 330665665962928288 |
| 20 | 6613313319249128577 |