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 | 5 |
| 4 | 16 |
| 5 | 66 |
| 6 | 343 |
| 7 | 2180 |
| 8 | 16505 |
| 9 | 145773 |
| 10 | 1477880 |
| 11 | 16986349 |
| 12 | 219158316 |
| 13 | 3147962668 |
| 14 | 49982588535 |
| 15 | 871766923048 |
| 16 | 16609804758449 |
| 17 | 344016348602845 |
| 18 | 7711752589539436 |
| 19 | 186379711851775401 |
| 20 | 4839449174872615116 |
| 21 | 134575228738532130948 |
| 22 | 3996183953610068510929 |