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 | 6 |
| 2 | 60 |
| 3 | 888 |
| 4 | 16944 |
| 5 | 403296 |
| 6 | 11342400 |
| 7 | 371718528 |
| 8 | 13814409984 |
| 9 | 577113570816 |
| 10 | 26660675466240 |
| 11 | 1354001083680768 |
| 12 | 74774085533159424 |
| 13 | 4471493494982516736 |
| 14 | 287295290091420794880 |
| 15 | 19770508871470350532608 |
| 16 | 1448690057046948138123264 |
| 17 | 112756550398510017376813056 |