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 | -147 |
| 37 | 184 |
| 38 | -213 |
| 39 | 228 |
| 40 | -222 |
| 41 | 188 |
| 42 | -120 |
| 43 | 14 |
| 44 | 133 |
| 45 | -318 |
| 46 | 533 |
| 47 | -764 |
| 48 | 990 |
| 49 | -1183 |
| 50 | 1309 |
| 51 | -1330 |
| 52 | 1204 |
| 53 | -892 |
| 54 | 363 |
| 55 | 400 |
| 56 | -1393 |
| 57 | 2584 |