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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | -1 |
| 4 | -12 |
| 5 | -19 |
| 6 | 22 |
| 7 | 139 |
| 8 | 168 |
| 9 | -359 |
| 10 | -1558 |
| 11 | -1321 |
| 12 | 5148 |
| 13 | 16901 |
| 14 | 8062 |
| 15 | -68381 |
| 16 | -177072 |
| 17 | -12239 |
| 18 | 860882 |
| 19 | 1782959 |
| 20 | -738492 |
| 21 | -10391779 |
| 22 | -17091098 |
| 23 | 17776699 |
| 24 | 121008888 |
| 25 | 153134281 |
| 26 | -298775878 |
| 27 | -1363223161 |
| 28 | -1232566932 |