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 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | -1 |
| 5 | 0 |
| 6 | 4 |
| 7 | -4 |
| 8 | 1 |
| 9 | 8 |
| 10 | -12 |
| 11 | 6 |
| 12 | 15 |
| 13 | -32 |
| 14 | 24 |
| 15 | 24 |
| 16 | -79 |
| 17 | 80 |
| 18 | 24 |
| 19 | -182 |
| 20 | 239 |
| 21 | -32 |
| 22 | -388 |
| 23 | 660 |
| 24 | -303 |
| 25 | -744 |
| 26 | 1708 |
| 27 | -1266 |
| 28 | -1185 |
| 29 | 4160 |
| 30 | -4240 |
| 31 | -1104 |
| 32 | 9505 |
| 33 | -12640 |
| 34 | 2032 |
| 35 | 20114 |
| 36 | -34785 |
| 37 | 16704 |
| 38 | 38196 |
| 39 | -89684 |
| 40 | 68193 |
| 41 | 59688 |
| 42 | -217564 |
| 43 | 226070 |
| 44 | 51183 |
| 45 | -494816 |
| 46 | 669704 |
| 47 | -123704 |
| 48 | -1040815 |
| 49 | 1834224 |