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 | -2 |
| 2 | 0 |
| 3 | 12 |
| 4 | 20 |
| 5 | -12 |
| 6 | -60 |
| 7 | 52 |
| 8 | 420 |
| 9 | 468 |
| 10 | -700 |
| 11 | -1548 |
| 12 | 3300 |
| 13 | 13588 |
| 14 | 8580 |
| 15 | -29388 |
| 16 | -30940 |
| 17 | 152148 |
| 18 | 406980 |
| 19 | 60532 |
| 20 | -1043100 |
| 21 | -236652 |
| 22 | 6032900 |
| 23 | 11173812 |
| 24 | -4569180 |
| 25 | -32487212 |
| 26 | 19343940 |
| 27 | 216401652 |
| 28 | 273243620 |
| 29 | -323927532 |
| 30 | -880031100 |
| 31 | 1489420852 |
| 32 | 7157028900 |