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 | 0 |
| 2 | 0 |
| 3 | 48 |
| 4 | 264 |
| 5 | 1680 |
| 6 | 11640 |
| 7 | 86352 |
| 8 | 673104 |
| 9 | 5424768 |
| 10 | 44828400 |
| 11 | 377810928 |
| 12 | 3235366752 |
| 13 | 28074857616 |
| 14 | 246353214240 |
| 15 | 2182457514960 |
| 16 | 19495053028800 |
| 17 | 175405981214592 |