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 | 131 |
| 4 | 12702 |
| 5 | 1331426 |
| 6 | 163594663 |
| 7 | 23979017805 |
| 8 | 4187448766444 |
| 9 | 864808560876788 |
| 10 | 209300424292684605 |
| 11 | 58811116750666789895 |
| 12 | 19017126570296402361706 |
| 13 | 7018937700334256743262646 |