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) |
|---|---|
| 0 | 1 |
| 1 | 1240 |
| 2 | 635660 |
| 3 | 173158720 |
| 4 | 26866494270 |
| 5 | 2390772025248 |
| 6 | 123244340937400 |
| 7 | 4235204881123840 |
| 8 | 107367902876988285 |
| 9 | 2147149471392237840 |
| 10 | 35461233105160369124 |
| 11 | 499800581310885326080 |
| 12 | 6159994549959101077830 |