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 | 6 |
| 2 | 60 |
| 3 | 648 |
| 4 | 6000 |
| 5 | 64800 |
| 6 | 466560 |
| 7 | 6637344 |
| 8 | 58752000 |
| 9 | 648646704 |
| 10 | 5890320000 |
| 11 | 66663457344 |
| 12 | 461894400000 |
| 13 | 6458084523072 |
| 14 | 60339430569600 |
| 15 | 610154104320000 |
| 16 | 5529599115264000 |
| 17 | 66666634474902192 |
| 18 | 441994921381739520 |
| 19 | 6666666666666666660 |
| 20 | 58301444908800000000 |