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 | 210 |
| 4 | 900 |
| 5 | 1080 |
| 6 | 1440 |
| 7 | 30030 |
| 8 | 69300 |
| 9 | 83160 |
| 10 | 110880 |
| 11 | 5292000 |
| 12 | 9261000 |
| 13 | 9525600 |
| 14 | 9699690 |
| 15 | 15315300 |
| 16 | 18378360 |
| 17 | 24504480 |
| 18 | 67737600 |
| 19 | 170100000 |
| 20 | 181440000 |
| 21 | 244944000 |
| 22 | 416215800 |
| 23 | 435456000 |
| 24 | 554954400 |
| 25 | 756756000 |
| 26 | 901800900 |
| 27 | 1324323000 |
| 28 | 1362160800 |
| 29 | 6469693230 |
| 30 | 6692786100 |