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 | 3 |
| 3 | 56 |
| 4 | 3360 |
| 5 | 833280 |
| 6 | 959938560 |
| 7 | 3901190307840 |
| 8 | 63667425823948800 |
| 9 | 4759267415191820697600 |
| 10 | 1246395024829755538853068800 |