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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 24 |
| 8 | 24 |
| 9 | 240 |
| 10 | 240 |
| 11 | 1560 |
| 12 | 1560 |
| 13 | 8400 |
| 14 | 8376 |
| 15 | 40824 |
| 16 | 40800 |
| 17 | 186480 |
| 18 | 186240 |
| 19 | 818520 |
| 20 | 818280 |
| 21 | 3497976 |
| 22 | 3496440 |
| 23 | 14676024 |
| 24 | 14674440 |
| 25 | 60780720 |
| 26 | 60772320 |
| 27 | 249401640 |
| 28 | 249393480 |
| 29 | 1016542800 |
| 30 | 1016501736 |
| 31 | 4123173624 |
| 32 | 4123132800 |
| 33 | 16664093400 |
| 34 | 16663908480 |