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 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 75 |
| 4 | 784 |
| 5 | 8820 |
| 6 | 104544 |
| 7 | 1288287 |
| 8 | 16359200 |
| 9 | 212751396 |
| 10 | 2821056160 |
| 11 | 38013731756 |
| 12 | 519227905728 |
| 13 | 7174705330000 |
| 14 | 100136810390400 |
| 15 | 1409850293610375 |
| 16 | 20002637245262400 |
| 17 | 285732116760449700 |
| 18 | 4106497099278420000 |
| 19 | 59341164471850545900 |
| 20 | 861753537765219528000 |