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 | 0 |
| 6 | -1 |
| 7 | 2 |
| 8 | -3 |
| 9 | 3 |
| 10 | -2 |
| 11 | 0 |
| 12 | 3 |
| 13 | -6 |
| 14 | 7 |
| 15 | -6 |
| 16 | 2 |
| 17 | 5 |
| 18 | -12 |
| 19 | 17 |
| 20 | -17 |
| 21 | 9 |
| 22 | 6 |
| 23 | -24 |
| 24 | 40 |
| 25 | -45 |
| 26 | 32 |
| 27 | -1 |
| 28 | -44 |
| 29 | 89 |
| 30 | -112 |
| 31 | 97 |
| 32 | -34 |
| 33 | -72 |
| 34 | 189 |
| 35 | -272 |
| 36 | 273 |
| 37 | -153 |
| 38 | -84 |
| 39 | 380 |
| 40 | -637 |
| 41 | 723 |
| 42 | -526 |
| 43 | 22 |
| 44 | 703 |
| 45 | -1427 |
| 46 | 1824 |
| 47 | -1593 |
| 48 | 575 |
| 49 | 1126 |
| 50 | -3041 |
| 51 | 4423 |
| 52 | -4461 |
| 53 | 2562 |
| 54 | 1251 |
| 55 | -6096 |