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 | 65535 |
| 2 | 42981185 |
| 3 | 4251920575 |
| 4 | 148292923329 |
| 5 | 2668522016831 |
| 6 | 30411820662145 |
| 7 | 248242046141055 |
| 8 | 1571545212141185 |
| 9 | 8146979811148159 |
| 10 | 35949729863572161 |
| 11 | 138934529031464255 |
| 12 | 480532350288143425 |
| 13 | 1512536728626191295 |
| 14 | 4390455017903519489 |
| 15 | 11878335717996660991 |