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 | 4 |
| 2 | 8 |
| 3 | 120 |
| 4 | 576 |
| 5 | 6240 |
| 6 | 75840 |
| 7 | 772800 |
| 8 | 11585280 |
| 9 | 163914240 |
| 10 | 2694558720 |
| 11 | 45947489280 |
| 12 | 876665180160 |
| 13 | 17329568256000 |
| 14 | 364677585592320 |
| 15 | 8306018798837760 |
| 16 | 195321474697789440 |
| 17 | 4892032896606535680 |