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 | -2 |
| 2 | 2 |
| 3 | 0 |
| 4 | -2 |
| 5 | 2 |
| 6 | 0 |
| 7 | 0 |
| 8 | -2 |
| 9 | 2 |
| 10 | 2 |
| 11 | -8 |
| 12 | 8 |
| 13 | 0 |
| 14 | -8 |
| 15 | 8 |
| 16 | -2 |
| 17 | 0 |
| 18 | -6 |
| 19 | 8 |
| 20 | 6 |
| 21 | -24 |
| 22 | 24 |
| 23 | 0 |
| 24 | -24 |
| 25 | 22 |
| 26 | -4 |
| 27 | 0 |
| 28 | -16 |
| 29 | 20 |
| 30 | 16 |
| 31 | -64 |
| 32 | 62 |
| 33 | 0 |
| 34 | -60 |
| 35 | 56 |
| 36 | -10 |
| 37 | 0 |
| 38 | -40 |
| 39 | 48 |
| 40 | 38 |
| 41 | -148 |
| 42 | 144 |
| 43 | 0 |
| 44 | -136 |
| 45 | 126 |
| 46 | -24 |
| 47 | 0 |
| 48 | -88 |
| 49 | 106 |
| 50 | 82 |
| 51 | -320 |
| 52 | 308 |
| 53 | 0 |
| 54 | -288 |
| 55 | 264 |
| 56 | -48 |
| 57 | 0 |
| 58 | -180 |
| 59 | 216 |
| 60 | 168 |
| 61 | -652 |
| 62 | 624 |