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 | 7 |
| 4 | 24 |
| 5 | 95 |
| 6 | 386 |
| 7 | 1641 |
| 8 | 7150 |
| 9 | 31844 |
| 10 | 144216 |
| 11 | 662228 |
| 12 | 3076044 |
| 13 | 14427582 |
| 14 | 68235078 |
| 15 | 325049475 |
| 16 | 1558212804 |
| 17 | 7511319253 |
| 18 | 36387218312 |
| 19 | 177050945886 |
| 20 | 864912345340 |
| 21 | 4240388439744 |
| 22 | 20857232340528 |
| 23 | 102896737106415 |