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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 83 |
| 5 | 4848 |
| 6 | 562713 |
| 7 | 94810999 |
| 8 | 21577786374 |
| 9 | 6367912802891 |
| 10 | 2366319275431001 |
| 11 | 1081610451348718567 |
| 12 | 596588083450068950934 |
| 13 | 390803766837390136477505 |