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 | 270 |
| 3 | 164989440 |
| 4 | 2701389600 |
| 5 | 71271827200 |
| 6 | 183694492800 |
| 7 | 7322605472000 |
| 8 | 28103080287744 |