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 | -3 |
| 2 | 1 |
| 3 | 12 |
| 4 | -7 |
| 5 | 1 |
| 6 | -60 |
| 7 | 47 |
| 8 | -12 |
| 9 | 1 |
| 10 | 360 |
| 11 | -342 |
| 12 | 119 |
| 13 | -18 |
| 14 | 1 |
| 15 | -2520 |
| 16 | 2754 |
| 17 | -1175 |
| 18 | 245 |
| 19 | -25 |
| 20 | 1 |
| 21 | 20160 |
| 22 | -24552 |
| 23 | 12154 |
| 24 | -3135 |
| 25 | 445 |
| 26 | -33 |
| 27 | 1 |
| 28 | -181440 |
| 29 | 241128 |
| 30 | -133938 |
| 31 | 40369 |
| 32 | -7140 |
| 33 | 742 |
| 34 | -42 |
| 35 | 1 |
| 36 | 1814400 |
| 37 | -2592720 |
| 38 | 1580508 |
| 39 | -537628 |