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 | 1 |
| 2 | 31 |
| 3 | 1891 |
| 4 | 117181 |
| 5 | 7263301 |
| 6 | 450207451 |
| 7 | 27905598631 |
| 8 | 1729696907641 |
| 9 | 107213302675081 |
| 10 | 6645495068947351 |
| 11 | 411913480972060651 |
| 12 | 25531990325198812981 |
| 13 | 1582571486681354344141 |
| 14 | 98093900183918770523731 |
| 15 | 6080239239916282418127151 |
| 16 | 376876738974625591153359601 |