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 | 13 |
| 3 | 389 |
| 4 | 4357 |
| 5 | 1960649 |
| 6 | 258805669 |
| 7 | 47102631757 |
| 8 | 11304631621681 |
| 9 | 691843455246877 |
| 10 | 1314502564969066301 |
| 11 | 607300185015708631061 |
| 12 | 335229702128671164345673 |
| 13 | 217899306383636256824687449 |
| 14 | 32946375125205802031892742289 |
| 15 | 848027998784883070051677094421 |