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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 1009 |
| 6 | 2 |
| 7 | 5702401 |
| 8 | 631 |
| 9 | 4481 |
| 10 | 13 |
| 11 | 566092801 |
| 12 | 3 |
| 13 | 23452949585516450807808000001 |
| 14 | 259201 |
| 15 | 337 |
| 16 | 2521 |
| 17 | 3553839003727872684550301886383176323956736000000001 |
| 18 | 41 |