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 | 5805311 |
| 3 | 392908759 |
| 4 | 399614833907 |
| 5 | 2674764845549 |
| 6 | 21997277871211 |
| 7 | 67146783889057 |