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) |
|---|---|
| 2 | 1 |
| 3 | -1 |
| 4 | 3 |
| 5 | -3 |
| 6 | 5 |
| 7 | -5 |
| 8 | 1 |
| 9 | -1 |
| 10 | 9 |
| 11 | -9 |
| 12 | 11 |
| 13 | -11 |
| 14 | 1 |
| 15 | -1 |
| 16 | 15 |
| 17 | -15 |
| 18 | 17 |
| 19 | -17 |
| 20 | 1 |
| 21 | -1 |
| 22 | 21 |
| 23 | -21 |
| 24 | 3 |
| 25 | -3 |
| 26 | 1 |
| 27 | -1 |
| 28 | 27 |
| 29 | -27 |
| 30 | 29 |
| 31 | -29 |
| 32 | 1 |
| 33 | -1 |
| 34 | 3 |
| 35 | -3 |
| 36 | 35 |
| 37 | -35 |
| 38 | 1 |
| 39 | -1 |
| 40 | 39 |
| 41 | -39 |
| 42 | 41 |
| 43 | -41 |
| 44 | 1 |
| 45 | -1 |
| 46 | 45 |
| 47 | -45 |
| 48 | 5 |
| 49 | -5 |
| 50 | 1 |
| 51 | -1 |
| 52 | 51 |
| 53 | -51 |
| 54 | 3 |
| 55 | -3 |
| 56 | 1 |
| 57 | -1 |
| 58 | 57 |
| 59 | -57 |
| 60 | 59 |
| 61 | -59 |
| 62 | 1 |
| 63 | -1 |
| 64 | 3 |
| 65 | -3 |
| 66 | 65 |
| 67 | -65 |
| 68 | 1 |
| 69 | -1 |
| 70 | 69 |
| 71 | -69 |
| 72 | 71 |
| 73 | -71 |
| 74 | 1 |
| 75 | -1 |
| 76 | 5 |
| 77 | -5 |
| 78 | 77 |
| 79 | -77 |
| 80 | 1 |
| 81 | -1 |
| 82 | 81 |
| 83 | -81 |
| 84 | 3 |
| 85 | -3 |
| 86 | 1 |