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) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | -2 |
| 4 | 2 |
| 5 | -8 |
| 6 | 0 |
| 7 | -8 |
| 8 | 8 |
| 9 | 0 |
| 10 | -26 |
| 11 | -6 |
| 12 | 6 |
| 13 | -26 |
| 14 | -6 |
| 15 | -14 |
| 16 | -26 |
| 17 | -6 |
| 18 | 14 |
| 19 | 26 |
| 20 | -6 |
| 21 | 38 |
| 22 | 26 |
| 23 | -80 |
| 24 | -128 |
| 25 | -48 |
| 26 | -80 |
| 27 | -24 |
| 28 | -128 |
| 29 | 24 |
| 30 | -80 |
| 31 | 24 |
| 32 | -80 |
| 33 | -32 |
| 34 | 24 |
| 35 | -56 |
| 36 | 0 |
| 37 | 24 |
| 38 | 80 |
| 39 | -24 |
| 40 | 0 |
| 41 | -48 |
| 42 | 80 |
| 43 | 24 |
| 44 | 80 |
| 45 | -24 |
| 46 | 104 |
| 47 | 80 |
| 48 | 80 |
| 49 | 48 |
| 50 | 104 |
| 51 | 0 |
| 52 | 24 |
| 53 | 80 |
| 54 | -398 |
| 55 | -338 |
| 56 | -278 |
| 57 | -434 |
| 58 | 18 |
| 59 | -138 |