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 | 1 |
| 2 | 141 |
| 3 | 5881 |
| 4 | 481381 |
| 5 | 39612501 |
| 6 | 3680774301 |
| 7 | 360255871641 |
| 8 | 37015866368181 |
| 9 | 3938448319935781 |
| 10 | 431222728237019041 |
| 11 | 48321459222257750541 |
| 12 | 5520471267708881730181 |
| 13 | 641062514242765723819621 |