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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 13 |
| 10 | 1 |
| 11 | 5 |
| 12 | 48 |
| 13 | 626 |
| 14 | 6570 |
| 15 | 1 |
| 16 | 25 |
| 17 | 1329 |
| 18 | 86715 |
| 19 | 4822394 |
| 20 | 181403533 |