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 | -1 |
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | -1 |
| 10 | 1 |
| 11 | 2 |
| 12 | -5 |
| 13 | 2 |
| 14 | 1 |
| 15 | 1 |
| 16 | 5 |
| 17 | -15 |
| 18 | 15 |
| 19 | -5 |
| 20 | -1 |
| 21 | 1 |
| 22 | 9 |
| 23 | -30 |
| 24 | 41 |
| 25 | -30 |
| 26 | 9 |
| 27 | 1 |
| 28 | 1 |
| 29 | 14 |
| 30 | -49 |
| 31 | 77 |
| 32 | -77 |
| 33 | 49 |
| 34 | -14 |
| 35 | -1 |
| 36 | 1 |
| 37 | 20 |
| 38 | -70 |
| 39 | 112 |
| 40 | -125 |
| 41 | 112 |
| 42 | -70 |
| 43 | 20 |
| 44 | 1 |
| 45 | 1 |
| 46 | 27 |
| 47 | -90 |
| 48 | 126 |
| 49 | -117 |
| 50 | 117 |
| 51 | -126 |
| 52 | 90 |
| 53 | -27 |
| 54 | -1 |
| 55 | 1 |
| 56 | 35 |
| 57 | -105 |
| 58 | 90 |
| 59 | 45 |
| 60 | -131 |
| 61 | 45 |
| 62 | 90 |
| 63 | -105 |
| 64 | 35 |
| 65 | 1 |