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 | 7 |
| 3 | 161 |
| 4 | 7631 |
| 5 | 607009 |
| 6 | 72605303 |
| 7 | 12172272321 |
| 8 | 2722634203807 |
| 9 | 783282749905601 |
| 10 | 281751782666559239 |
| 11 | 123890976070562785633 |
| 12 | 65380371270827869603439 |
| 13 | 40779819387085820255904481 |
| 14 | 29677003954344675666092048791 |
| 15 | 24921035407468294238607282809729 |