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 | 36 |
| 3 | 1200 |
| 4 | 37800 |
| 5 | 83160 |
| 6 | 846720 |
| 7 | 1965600 |
| 8 | 15724800 |
| 9 | 34927200 |
| 10 | 279417600 |
| 11 | 1437836400 |
| 12 | 11502691200 |
| 13 | 5751345600 |
| 14 | 160626866400 |
| 15 | 46010764800 |
| 16 | 1927522396800 |
| 17 | 8561475468000 |
| 18 | 80173757664000 |