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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 3 |
| 9 | 6 |
| 10 | 12 |
| 11 | 24 |
| 12 | 63 |
| 13 | 164 |
| 14 | 424 |
| 15 | 1163 |
| 16 | 2919 |
| 17 | 8289 |
| 18 | 24060 |
| 19 | 70704 |
| 20 | 212130 |
| 21 | 672520 |
| 22 | 2080293 |
| 23 | 6485878 |
| 24 | 20449084 |