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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 13 |
| 10 | 23 |
| 11 | 46 |
| 12 | 445 |
| 13 | 2116 |
| 14 | 15226 |
| 15 | 313725 |
| 16 | 1527465 |
| 17 | 3454446 |
| 18 | 2426472326 |
| 19 | 3066511287 |
| 20 | 102461381175475216 |