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 | 3 |
| 3 | 7 |
| 4 | 9 |
| 5 | 27 |
| 6 | 230631 |
| 7 | 626331 |
| 8 | 837799 |
| 9 | 1723519 |
| 10 | 3732423 |
| 11 | 5649499 |
| 12 | 6649279 |
| 13 | 8400511 |
| 14 | 63728127 |
| 15 | 3743559068799 |
| 16 | 100759293214567 |
| 17 | 104899295810901231 |