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 | 2 |
| 4 | 6 |
| 5 | 17 |
| 6 | 58 |
| 7 | 191 |
| 8 | 700 |
| 9 | 2515 |
| 10 | 9623 |
| 11 | 36552 |
| 12 | 143761 |
| 13 | 564443 |
| 14 | 2259905 |
| 15 | 9057278 |
| 16 | 36705846 |
| 17 | 149046429 |
| 18 | 609246350 |
| 19 | 2495727647 |
| 20 | 10267016450 |
| 21 | 42322763940 |
| 22 | 174974139365 |