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 | 3 |
| 2 | 9 |
| 3 | 43 |
| 4 | 324 |
| 5 | 3510 |
| 6 | 50528 |
| 7 | 913377 |
| 8 | 19918602 |
| 9 | 509040779 |
| 10 | 14918466255 |
| 11 | 493115508126 |
| 12 | 18143982947900 |
| 13 | 735340631600946 |
| 14 | 32542320101428755 |
| 15 | 1561227609244084205 |
| 16 | 80700623119099359600 |
| 17 | 4470904603875492038790 |