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 | 6 |
| 3 | 54 |
| 4 | 648 |
| 5 | 9720 |
| 6 | 174960 |
| 7 | 3674160 |
| 8 | 88179840 |
| 9 | 2380855680 |
| 10 | 71425670400 |
| 11 | 2357047123200 |
| 12 | 84853696435200 |
| 13 | 3309294160972800 |
| 14 | 138990354760857600 |
| 15 | 6254565964238592000 |
| 16 | 300219166283452416000 |
| 17 | 15311177480456073216000 |