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 | 2 |
| 2 | 13 |
| 3 | 247 |
| 4 | 4063 |
| 5 | 16775167 |
| 6 | 4294934527 |
| 7 | 68719345663 |
| 8 | 1152921504069976063 |
| 9 | 1329227995784915872327346307976921087 |
| 10 | 95780971304118053647396689042151819065498660774084607 |