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 | 49 |
| 3 | 588 |
| 4 | 61009 |
| 5 | 1647243 |
| 6 | 473323536 |
| 7 | 22719529728 |
| 8 | 13058834917401 |
| 9 | 979412618805075 |
| 10 | 949149594515775744 |
| 11 | 102508156207703780352 |
| 12 | 150861990726485797358601 |
| 13 | 22176712636793412211714347 |