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 | 1 |
| 3 | -1 |
| 4 | -1 |
| 5 | -1 |
| 6 | 1 |
| 7 | -1 |
| 8 | -3 |
| 9 | 4 |
| 10 | -1 |
| 11 | 37 |
| 12 | -88 |
| 13 | 69 |
| 14 | -19 |
| 15 | 1 |
| 16 | 10879 |
| 17 | -14344 |
| 18 | 6831 |
| 19 | -1375 |
| 20 | 99 |
| 21 | -1 |
| 22 | -4322473 |
| 23 | -40529664 |
| 24 | -17486038 |
| 25 | 3188841 |
| 26 | -40896 |
| 27 | -2346 |
| 28 | 1 |
| 29 | -11384127259974047 |
| 30 | -783824545942228 |
| 31 | 1058675233347 |
| 32 | 505084925760 |
| 33 | -64007100 |
| 34 | -32568519 |
| 35 | 23164 |
| 36 | -1 |
| 37 | -121986767767877481129923 |