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 | -8 |
| 3 | -20 |
| 4 | -8 |
| 5 | 134 |
| 6 | 512 |
| 7 | 1062 |
| 8 | 406 |
| 9 | -5319 |
| 10 | -22532 |
| 11 | -51843 |
| 12 | -58869 |
| 13 | 83035 |
| 14 | 648412 |
| 15 | 1947384 |
| 16 | 3665081 |
| 17 | 3040131 |
| 18 | -8272126 |
| 19 | -46481039 |
| 20 | -128400098 |
| 21 | -234847560 |
| 22 | -215189896 |
| 23 | 378947363 |
| 24 | 2437661943 |
| 25 | 7036096665 |
| 26 | 13868464378 |
| 27 | 16886982518 |
| 28 | -4042283985 |
| 29 | -93095770772 |