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 | -1 |
| 8 | 1 |
| 9 | 0 |
| 10 | -1 |
| 11 | 2 |
| 12 | -3 |
| 13 | 4 |
| 14 | -5 |
| 15 | 6 |
| 16 | -7 |
| 17 | 7 |
| 18 | -6 |
| 19 | 4 |
| 20 | -1 |
| 21 | -3 |
| 22 | 8 |
| 23 | -14 |
| 24 | 21 |
| 25 | -28 |
| 26 | 34 |
| 27 | -38 |
| 28 | 39 |
| 29 | -36 |
| 30 | 28 |
| 31 | -14 |
| 32 | -7 |
| 33 | 35 |
| 34 | -69 |
| 35 | 107 |
| 36 | -146 |
| 37 | 182 |
| 38 | -210 |
| 39 | 224 |
| 40 | -217 |
| 41 | 182 |
| 42 | -113 |
| 43 | 6 |
| 44 | 140 |
| 45 | -322 |
| 46 | 532 |
| 47 | -756 |
| 48 | 973 |
| 49 | -1155 |
| 50 | 1268 |
| 51 | -1274 |
| 52 | 1134 |
| 53 | -812 |
| 54 | 280 |
| 55 | 476 |
| 56 | -1449 |
| 57 | 2604 |
| 58 | -3872 |
| 59 | 5146 |
| 60 | -6280 |
| 61 | 7092 |
| 62 | -7372 |
| 63 | 6896 |
| 64 | -5447 |
| 65 | 2843 |
| 66 | 1029 |