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 | -11 |
| 5 | 1 |
| 6 | 1 |
| 7 | -46 |
| 8 | 37 |
| 9 | -1 |
| 10 | 1 |
| 11 | -162 |
| 12 | 299 |
| 13 | -99 |
| 14 | 1 |
| 15 | 1 |
| 16 | -567 |
| 17 | 1675 |
| 18 | -1324 |
| 19 | 225 |
| 20 | -1 |
| 21 | 1 |
| 22 | -1872 |
| 23 | 8316 |
| 24 | -11315 |
| 25 | 5292 |
| 26 | -432 |
| 27 | 1 |
| 28 | 1 |
| 29 | -5881 |
| 30 | 40254 |
| 31 | -79457 |
| 32 | 60782 |
| 33 | -16458 |
| 34 | 760 |
| 35 | -1 |
| 36 | 1 |
| 37 | -17990 |
| 38 | 182413 |
| 39 | -490520 |
| 40 | 543130 |
| 41 | -260498 |
| 42 | 45424 |
| 43 | -1232 |