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 | 0 |
| 2 | 1 |
| 3 | 75 |
| 4 | 9345 |
| 5 | 1865745 |
| 6 | 554479695 |
| 7 | 231052877055 |
| 8 | 128938132548225 |
| 9 | 92986310399407425 |
| 10 | 84250567868935042575 |
| 11 | 93744545254140599193375 |
| 12 | 125717783386887888296925825 |
| 13 | 200041202339679732328342670625 |
| 14 | 372688996228146502285257581079375 |
| 15 | 803768398459351988653830600415029375 |