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 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | -1 |
| 8 | -2 |
| 9 | 0 |
| 10 | 4 |
| 11 | 4 |
| 12 | -5 |
| 13 | -13 |
| 14 | -2 |
| 15 | 26 |
| 16 | 30 |
| 17 | -29 |
| 18 | -94 |
| 19 | -26 |
| 20 | 189 |
| 21 | 246 |
| 22 | -198 |
| 23 | -769 |
| 24 | -302 |
| 25 | 1512 |
| 26 | 2228 |
| 27 | -1372 |
| 28 | -6691 |
| 29 | -3425 |
| 30 | 12672 |
| 31 | 21046 |
| 32 | -9503 |
| 33 | -60776 |
| 34 | -38353 |
| 35 | 109719 |
| 36 | 205330 |
| 37 | -61001 |
| 38 | -567518 |
| 39 | -427145 |
| 40 | 967914 |
| 41 | 2045196 |
| 42 | -314417 |
| 43 | -5405209 |
| 44 | -4743873 |
| 45 | 8625547 |