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 | 2 |
| 3 | 8 |
| 4 | 31 |
| 5 | 129 |
| 6 | 510 |
| 7 | 1970 |
| 8 | 7513 |
| 9 | 28253 |
| 10 | 105176 |
| 11 | 388330 |
| 12 | 1423691 |
| 13 | 5188577 |
| 14 | 18812848 |
| 15 | 67907520 |
| 16 | 244160177 |
| 17 | 874821817 |
| 18 | 3124747792 |
| 19 | 11130097846 |
| 20 | 39544807851 |
| 21 | 140180597013 |
| 22 | 495886522916 |
| 23 | 1750852227736 |
| 24 | 6171019594129 |