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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 108 |
| 4 | 1296 |
| 5 | 19440 |
| 6 | 349920 |
| 7 | 7348320 |
| 8 | 176359680 |
| 9 | 4761711360 |
| 10 | 142851340800 |
| 11 | 4714094246400 |
| 12 | 169707392870400 |
| 13 | 6618588321945600 |
| 14 | 277980709521715200 |
| 15 | 12509131928477184000 |
| 16 | 600438332566904832000 |