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 | 0 |
| 2 | 17400 |
| 3 | 645120 |
| 4 | 8699640 |
| 5 | 64266240 |
| 6 | 334145760 |
| 7 | 1327902720 |
| 8 | 4450873080 |
| 9 | 12747325440 |
| 10 | 33162177744 |
| 11 | 77585418240 |
| 12 | 171110020320 |
| 13 | 348920586240 |
| 14 | 685157000640 |
| 15 | 1264980234240 |
| 16 | 2278793539320 |
| 17 | 3901915054080 |