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 | 7 |
| 3 | 49 |
| 4 | 421 |
| 5 | 3697 |
| 6 | 37933 |
| 7 | 404341 |
| 8 | 4841341 |
| 9 | 61291861 |
| 10 | 848268421 |
| 11 | 12465197269 |
| 12 | 197121724549 |
| 13 | 3302727019621 |
| 14 | 58876330343173 |
| 15 | 1107627703783909 |
| 16 | 21990846791015845 |
| 17 | 458649487144877029 |
| 18 | 10035575758396240549 |
| 19 | 229687317927141716005 |
| 20 | 5489966024995169233573 |