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 | 0 |
| 2 | 207 |
| 3 | 130398 |
| 4 | 5694207 |
| 5 | 426424828 |
| 6 | 18304641024 |
| 7 | 1002719491659 |