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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 13 |
| 5 | 55 |
| 6 | 241 |
| 7 | 1171 |
| 8 | 6357 |
| 9 | 37567 |
| 10 | 236521 |
| 11 | 1574331 |
| 12 | 11068333 |
| 13 | 82110535 |
| 14 | 640794337 |
| 15 | 5239439011 |
| 16 | 44723250501 |
| 17 | 397481121295 |
| 18 | 3671081354137 |
| 19 | 35176098791115 |
| 20 | 349120380267421 |
| 21 | 3583273413146647 |
| 22 | 37975511840454673 |
| 23 | 415004245048757299 |
| 24 | 4670891190907818165 |