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 | 9 |
| 3 | 51 |
| 4 | 1275 |
| 5 | 8415 |
| 6 | 115005 |
| 7 | 805035 |
| 8 | 45886995 |
| 9 | 331406075 |
| 10 | 4838528695 |
| 11 | 35629165845 |
| 12 | 1056998586735 |
| 13 | 7886835608715 |
| 14 | 118302534130725 |
| 15 | 891212423784795 |
| 16 | 107836703277960195 |
| 17 | 818290277815109715 |