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 | 15 |
| 3 | 1173 |
| 4 | 730503 |
| 5 | 4022141121 |
| 6 | 169908632412447 |
| 7 | 55314799986833459367 |
| 8 | 140277459587738407279576815 |