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 | -1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | -5 |
| 7 | 6 |
| 8 | 4 |
| 9 | 1 |
| 10 | -3 |
| 11 | -12 |
| 12 | 29 |
| 13 | 57 |
| 14 | -72 |
| 15 | -46 |
| 16 | 1 |
| 17 | -4 |
| 18 | -22 |
| 19 | 80 |
| 20 | 261 |
| 21 | -660 |
| 22 | -1264 |
| 23 | 1608 |
| 24 | 1024 |
| 25 | 1 |
| 26 | -5 |
| 27 | -35 |
| 28 | 170 |
| 29 | 775 |
| 30 | -2941 |
| 31 | -9385 |
| 32 | 23880 |
| 33 | 45620 |
| 34 | -58080 |
| 35 | -36976 |
| 36 | 1 |
| 37 | -6 |
| 38 | -51 |
| 39 | 310 |
| 40 | 1815 |
| 41 | -9186 |
| 42 | -41033 |
| 43 | 156618 |
| 44 | 498660 |
| 45 | -1269720 |
| 46 | -2425056 |
| 47 | 3087648 |