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 | 3 |
| 2 | 17 |
| 3 | 173 |
| 4 | 2983 |
| 5 | 298327 |
| 6 | 1732017 |
| 7 | 5412290577 |
| 8 | 9964933517 |
| 9 | 5405829167667 |
| 10 | 17320185602062360469701767 |