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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -4 |
| 9 | 0 |
| 10 | 0 |
| 11 | -1 |
| 12 | 47 |
| 13 | -10 |
| 14 | -1 |
| 15 | 0 |
| 16 | 1 |
| 17 | -221 |
| 18 | 205 |
| 19 | -209 |
| 20 | 0 |
| 21 | 0 |
| 22 | -1 |
| 23 | 953 |
| 24 | -5495 |
| 25 | 10789 |
| 26 | -427 |
| 27 | 1 |
| 28 | 0 |
| 29 | 1 |
| 30 | -3953 |
| 31 | 123445 |
| 32 | -8646163 |
| 33 | 177093 |
| 34 | -22807 |
| 35 | 0 |
| 36 | 0 |
| 37 | -1 |
| 38 | 16097 |
| 39 | -2534735 |
| 40 | 22337747 |
| 41 | -356249173 |
| 42 | 3440131 |
| 43 | -46212 |
| 44 | -1 |