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 | 15 |
| 2 | 208 |
| 3 | 6976 |
| 4 | 8415 |
| 5 | 31815 |
| 6 | 351351 |
| 7 | 2077696 |
| 8 | 20487159 |
| 9 | 159030135 |
| 10 | 536559616 |
| 11 | 2586415095 |
| 12 | 137433972736 |
| 13 | 2199003332608 |