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 | -2 |
| 4 | -2 |
| 5 | 0 |
| 6 | 4 |
| 7 | 4 |
| 8 | -2 |
| 9 | -10 |
| 10 | -6 |
| 11 | 10 |
| 12 | 22 |
| 13 | 4 |
| 14 | -34 |
| 15 | -46 |
| 16 | 16 |
| 17 | 102 |
| 18 | 86 |
| 19 | -100 |
| 20 | -272 |
| 21 | -126 |
| 22 | 370 |
| 23 | 650 |
| 24 | 60 |
| 25 | -1138 |
| 26 | -1384 |
| 27 | 526 |
| 28 | 3142 |
| 29 | 2532 |
| 30 | -2936 |
| 31 | -7952 |
| 32 | -3440 |
| 33 | 10802 |
| 34 | 18426 |
| 35 | 596 |
| 36 | -33344 |
| 37 | -38418 |
| 38 | 18716 |
| 39 | 91934 |
| 40 | 68400 |
| 41 | -93402 |
| 42 | -230962 |
| 43 | -86236 |
| 44 | 330144 |
| 45 | 528880 |
| 46 | -17298 |
| 47 | -996040 |