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 | 7 |
| 2 | 31 |
| 3 | 631 |
| 4 | 14071 |
| 5 | 116471 |
| 6 | 24663654391 |
| 7 | 1282510028791 |
| 8 | 17450008575991 |
| 9 | 333247405883391991 |
| 10 | 5444123475574783991 |