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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 1 |
| 5 | -36 |
| 6 | 8 |
| 7 | 9 |
| 8 | 1 |
| 9 | -288 |
| 10 | 18 |
| 11 | 83 |
| 12 | 18 |
| 13 | 1 |
| 14 | 7200 |
| 15 | -2352 |
| 16 | -2366 |
| 17 | 165 |
| 18 | 205 |
| 19 | 27 |
| 20 | 1 |
| 21 | 86400 |
| 22 | -18000 |
| 23 | -31936 |
| 24 | -926 |
| 25 | 2735 |
| 26 | 565 |
| 27 | 41 |
| 28 | 1 |
| 29 | -4233600 |
| 30 | 1647360 |
| 31 | 1541304 |
| 32 | -286084 |
| 33 | -187614 |
| 34 | -1491 |
| 35 | 7056 |
| 36 | 1014 |
| 37 | 54 |
| 38 | 1 |
| 39 | -67737600 |
| 40 | 19968480 |
| 41 | 27275064 |
| 42 | -2562556 |
| 43 | -3442594 |
| 44 | -254583 |
| 45 | 115605 |
| 46 | 24906 |