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 | 0 |
| 1 | 5 |
| 2 | 34 |
| 3 | 236 |
| 4 | 1714 |
| 5 | 12922 |
| 6 | 100300 |
| 7 | 796572 |
| 8 | 6443536 |
| 9 | 52909593 |
| 10 | 439896626 |
| 11 | 3695917940 |
| 12 | 31331587252 |
| 13 | 267669458420 |
| 14 | 2302188456120 |
| 15 | 19918434257052 |
| 16 | 173240112503520 |
| 17 | 1513821095788420 |
| 18 | 13283883136738344 |
| 19 | 117009704490121520 |
| 20 | 1034217260142108570 |
| 21 | 9169842145476773250 |
| 22 | 81537271617856588380 |