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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 12 |
| 6 | 1 |
| 7 | 50 |
| 8 | 24 |
| 9 | 1 |
| 10 | 180 |
| 11 | 360 |
| 12 | 1 |
| 13 | 602 |
| 14 | 3360 |
| 15 | 720 |
| 16 | 1 |
| 17 | 1932 |
| 18 | 25200 |
| 19 | 20160 |
| 20 | 1 |
| 21 | 6050 |
| 22 | 166824 |
| 23 | 332640 |
| 24 | 40320 |
| 25 | 1 |
| 26 | 18660 |
| 27 | 1020600 |
| 28 | 4233600 |
| 29 | 1814400 |
| 30 | 1 |
| 31 | 57002 |
| 32 | 5921520 |
| 33 | 46070640 |
| 34 | 46569600 |
| 35 | 3628800 |
| 36 | 1 |
| 37 | 173052 |
| 38 | 33105600 |
| 39 | 451725120 |
| 40 | 898128000 |
| 41 | 239500800 |