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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 10 |
| 6 | 34 |
| 7 | 71 |
| 8 | 246 |
| 9 | 522 |
| 10 | 1783 |
| 11 | 3765 |
| 12 | 12858 |
| 13 | 27496 |
| 14 | 94525 |
| 15 | 203318 |
| 16 | 702789 |
| 17 | 1522315 |
| 18 | 5290592 |
| 19 | 11519095 |
| 20 | 40214441 |
| 21 | 87947507 |
| 22 | 308236670 |