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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | -2 |
| 6 | 2 |
| 7 | 0 |
| 8 | -6 |
| 9 | -6 |
| 10 | 6 |
| 11 | 0 |
| 12 | -4 |
| 13 | 4 |
| 14 | -10 |
| 15 | -14 |
| 16 | 10 |
| 17 | 4 |
| 18 | 14 |
| 19 | -30 |
| 20 | -42 |
| 21 | 0 |
| 22 | -42 |
| 23 | -18 |
| 24 | 12 |
| 25 | 30 |
| 26 | 18 |
| 27 | -12 |
| 28 | 0 |
| 29 | 18 |
| 30 | 42 |
| 31 | 0 |
| 32 | -62 |
| 33 | -8 |
| 34 | -70 |
| 35 | -20 |
| 36 | -82 |
| 37 | -28 |
| 38 | -34 |
| 39 | -62 |
| 40 | -8 |
| 41 | -26 |
| 42 | 8 |
| 43 | -62 |
| 44 | 62 |
| 45 | 34 |
| 46 | -28 |
| 47 | 8 |
| 48 | -28 |
| 49 | 28 |
| 50 | 62 |
| 51 | 82 |
| 52 | -8 |
| 53 | 98 |
| 54 | 28 |
| 55 | 0 |
| 56 | -186 |
| 57 | -84 |
| 58 | -210 |
| 59 | -60 |