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 | 0 |
| 5 | 1 |
| 6 | -2 |
| 7 | 3 |
| 8 | -3 |
| 9 | 1 |
| 10 | 2 |
| 11 | -6 |
| 12 | 10 |
| 13 | -11 |
| 14 | 8 |
| 15 | 0 |
| 16 | -14 |
| 17 | 29 |
| 18 | -39 |
| 19 | 38 |
| 20 | -18 |
| 21 | -22 |
| 22 | 74 |
| 23 | -123 |
| 24 | 144 |
| 25 | -110 |
| 26 | 6 |
| 27 | 161 |
| 28 | -352 |
| 29 | 491 |
| 30 | -484 |
| 31 | 251 |
| 32 | 235 |
| 33 | -896 |
| 34 | 1528 |
| 35 | -1825 |
| 36 | 1452 |
| 37 | -191 |
| 38 | -1892 |
| 39 | 4317 |
| 40 | -6164 |
| 41 | 6243 |
| 42 | -3488 |
| 43 | -2482 |
| 44 | 10788 |
| 45 | -18957 |
| 46 | 23140 |
| 47 | -19085 |
| 48 | 3858 |
| 49 | 22025 |
| 50 | -52833 |
| 51 | 77224 |
| 52 | -80198 |
| 53 | 47899 |