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) |
|---|---|
| 3 | 575 |
| 4 | 865 |
| 5 | 39743 |
| 6 | 19153 |
| 7 | 3681784 |
| 8 | 18198125 |
| 9 | 325151875 |
| 10 | 226462663 |
| 11 | 218431158848 |
| 12 | 163390785768 |
| 13 | 275577122835000 |
| 14 | 216187828065000 |
| 15 | 172736941569984 |
| 16 | 1121674137386517 |
| 17 | 4534605234349771581 |
| 18 | 3776294388104363125 |
| 19 | 21799582086436073920000 |
| 20 | 18520810592837638076992 |