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 | 39 |
| 3 | 571 |
| 4 | 911 |
| 5 | 13299 |
| 6 | 194141 |
| 7 | 309739 |
| 8 | 4521621 |
| 9 | 66007369 |
| 10 | 105310349 |
| 11 | 1537337841 |
| 12 | 22442311319 |
| 13 | 35805208921 |
| 14 | 522690344319 |
| 15 | 7630319841091 |
| 16 | 12173665722791 |
| 17 | 177713179730619 |
| 18 | 2594286303659621 |
| 19 | 4139010540540019 |
| 20 | 60421958418066141 |
| 21 | 882049712924430049 |