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 | -2 |
| 2 | -2 |
| 3 | 0 |
| 4 | 6 |
| 5 | 8 |
| 6 | 4 |
| 7 | -4 |
| 8 | -18 |
| 9 | -34 |
| 10 | -32 |
| 11 | -8 |
| 12 | 36 |
| 13 | 96 |
| 14 | 144 |
| 15 | 152 |
| 16 | 94 |
| 17 | -60 |
| 18 | -294 |
| 19 | -560 |
| 20 | -760 |
| 21 | -760 |
| 22 | -460 |
| 23 | 228 |
| 24 | 1276 |
| 25 | 2486 |
| 26 | 3576 |
| 27 | 4080 |
| 28 | 3456 |
| 29 | 1304 |
| 30 | -2576 |
| 31 | -7956 |
| 32 | -13986 |
| 33 | -19208 |
| 34 | -21644 |
| 35 | -19056 |
| 36 | -9462 |
| 37 | 8200 |
| 38 | 33364 |
| 39 | 63224 |
| 40 | 92384 |
| 41 | 112860 |
| 42 | 114976 |
| 43 | 88896 |
| 44 | 26660 |
| 45 | -74792 |