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 | 0 |
| 3 | 1 |
| 4 | -2 |
| 5 | 2 |
| 6 | 0 |
| 7 | -3 |
| 8 | 4 |
| 9 | -2 |
| 10 | -2 |
| 11 | 6 |
| 12 | -6 |
| 13 | 0 |
| 14 | 8 |
| 15 | -11 |
| 16 | 4 |
| 17 | 10 |
| 18 | -20 |
| 19 | 14 |
| 20 | 10 |
| 21 | -36 |
| 22 | 38 |
| 23 | -2 |
| 24 | -54 |
| 25 | 84 |
| 26 | -46 |
| 27 | -56 |
| 28 | 152 |
| 29 | -144 |
| 30 | -8 |
| 31 | 221 |
| 32 | -316 |
| 33 | 146 |
| 34 | 244 |
| 35 | -570 |
| 36 | 482 |
| 37 | 120 |
| 38 | -876 |
| 39 | 1110 |
| 40 | -350 |
| 41 | -1108 |
| 42 | 2138 |
| 43 | -1520 |
| 44 | -896 |
| 45 | 3548 |
| 46 | -3914 |
| 47 | 566 |
| 48 | 4906 |
| 49 | -8068 |
| 50 | 4714 |
| 51 | 4864 |
| 52 | -14080 |
| 53 | 13652 |
| 54 | 466 |
| 55 | -20656 |