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 | 1 |
| 2 | -6 |
| 3 | 0 |
| 4 | 36 |
| 5 | 12 |
| 6 | 0 |
| 7 | 24 |
| 8 | -216 |
| 9 | 0 |
| 10 | -72 |
| 11 | 48 |
| 12 | 0 |
| 13 | 60 |
| 14 | -144 |
| 15 | 0 |
| 16 | 1296 |
| 17 | 84 |
| 18 | 0 |
| 19 | 96 |
| 20 | 432 |
| 21 | 0 |
| 22 | -288 |
| 23 | 120 |
| 24 | 0 |
| 25 | 144 |
| 26 | -360 |
| 27 | 0 |
| 28 | 864 |
| 29 | 156 |
| 30 | 0 |
| 31 | 168 |
| 32 | -7776 |
| 33 | 0 |
| 34 | -504 |
| 35 | 288 |
| 36 | 0 |
| 37 | 204 |
| 38 | -576 |
| 39 | 0 |
| 40 | -2592 |
| 41 | 228 |
| 42 | 0 |
| 43 | 240 |
| 44 | 1728 |
| 45 | 0 |
| 46 | -720 |
| 47 | 264 |
| 48 | 0 |
| 49 | 576 |
| 50 | -864 |
| 51 | 0 |
| 52 | 2160 |
| 53 | 300 |
| 54 | 0 |
| 55 | 576 |
| 56 | -5184 |
| 57 | 0 |
| 58 | -936 |
| 59 | 336 |