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 | 2 |
| 5 | 8 |
| 6 | 12 |
| 7 | 88 |
| 8 | 176 |
| 9 | 2752 |
| 10 | 8784 |
| 11 | 279968 |
| 12 | 1492288 |
| 13 | 95458560 |
| 14 | 872687552 |
| 15 | 111698291584 |
| 16 | 1787154671104 |
| 17 | 457509297625088 |
| 18 | 13013584213369088 |
| 19 | 6662951988432581120 |
| 20 | 341143107490935724032 |
| 21 | 349330527429800077778944 |
| 22 | 32519496073514216703585280 |