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 | 3 |
| 3 | 19 |
| 4 | 195 |
| 5 | 2791 |
| 6 | 51303 |
| 7 | 1152019 |
| 8 | 30564075 |
| 9 | 935494831 |
| 10 | 32447734143 |
| 11 | 1257770533339 |
| 12 | 53884306900515 |
| 13 | 2528224238464471 |
| 14 | 128934398091500823 |
| 15 | 7101273378743303779 |
| 16 | 420078397130637237915 |
| 17 | 26563302733186339752511 |