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 | 5 |
| 2 | 55 |
| 3 | 935 |
| 4 | 21505 |
| 5 | 623645 |
| 6 | 25569445 |
| 7 | 1201763915 |
| 8 | 63693487495 |
| 9 | 3757915762205 |
| 10 | 266812019116555 |
| 11 | 22145397586674065 |
| 12 | 1970940385213991785 |
| 13 | 199064978906613170285 |
| 14 | 21299952743007609220495 |
| 15 | 2406894659959859841915935 |
| 16 | 315303200454741639290987485 |