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 | 6 |
| 3 | 45 |
| 4 | 504 |
| 5 | 7785 |
| 6 | 153468 |
| 7 | 3681909 |
| 8 | 104126256 |
| 9 | 3392064945 |
| 10 | 125089571700 |
| 11 | 5151335388309 |
| 12 | 234322765501608 |
| 13 | 11668410187187481 |
| 14 | 631335472193760012 |
| 15 | 36881146426978035765 |
| 16 | 2313552152470193124192 |
| 17 | 155107536736245864549345 |