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 | 3 |
| 5 | 3 |
| 6 | -1 |
| 7 | -9 |
| 8 | -5 |
| 9 | 11 |
| 10 | 23 |
| 11 | -1 |
| 12 | -45 |
| 13 | -45 |
| 14 | 47 |
| 15 | 135 |
| 16 | 43 |
| 17 | -229 |
| 18 | -313 |
| 19 | 143 |
| 20 | 771 |
| 21 | 483 |
| 22 | -1057 |
| 23 | -2025 |
| 24 | 91 |
| 25 | 4139 |
| 26 | 3959 |
| 27 | -4321 |
| 28 | -12237 |
| 29 | -3597 |
| 30 | 20879 |
| 31 | 28071 |
| 32 | -13685 |
| 33 | -69829 |
| 34 | -42457 |
| 35 | 97199 |
| 36 | 182115 |
| 37 | -12285 |
| 38 | -376513 |
| 39 | -351945 |
| 40 | 401083 |
| 41 | 1104971 |
| 42 | 302807 |
| 43 | -1907137 |
| 44 | -2512749 |
| 45 | 1301523 |
| 46 | 6327023 |