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 | 4 |
| 3 | 119 |
| 4 | 10120 |
| 5 | 4219759 |
| 6 | 7032604532 |
| 7 | 48994677634459 |
| 8 | 1392340919671593156 |