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 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | -1 |
| 7 | 2 |
| 8 | -2 |
| 9 | 0 |
| 10 | 4 |
| 11 | -5 |
| 12 | 6 |
| 13 | -7 |
| 14 | 5 |
| 15 | 3 |
| 16 | -14 |
| 17 | 22 |
| 18 | -29 |
| 19 | 23 |
| 20 | 1 |
| 21 | -27 |
| 22 | 57 |
| 23 | -92 |
| 24 | 96 |
| 25 | -50 |
| 26 | -38 |
| 27 | 157 |
| 28 | -281 |
| 29 | 341 |
| 30 | -270 |
| 31 | 57 |
| 32 | 304 |
| 33 | -777 |
| 34 | 1156 |
| 35 | -1175 |
| 36 | 695 |
| 37 | 357 |
| 38 | -1897 |
| 39 | 3447 |
| 40 | -4274 |
| 41 | 3677 |
| 42 | -1045 |
| 43 | -3723 |
| 44 | 9521 |
| 45 | -14161 |
| 46 | 15044 |
| 47 | -9633 |
| 48 | -3494 |
| 49 | 22711 |
| 50 | -42509 |
| 51 | 54373 |
| 52 | -48146 |