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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -1 |
| 8 | 2 |
| 9 | -2 |
| 10 | 1 |
| 11 | 1 |
| 12 | -3 |
| 13 | 4 |
| 14 | -3 |
| 15 | 0 |
| 16 | 4 |
| 17 | -7 |
| 18 | 7 |
| 19 | -3 |
| 20 | -4 |
| 21 | 11 |
| 22 | -14 |
| 23 | 10 |
| 24 | 1 |
| 25 | -15 |
| 26 | 25 |
| 27 | -24 |
| 28 | 9 |
| 29 | 16 |
| 30 | -40 |
| 31 | 49 |
| 32 | -33 |
| 33 | -7 |
| 34 | 56 |
| 35 | -89 |
| 36 | 82 |
| 37 | -26 |
| 38 | -63 |
| 39 | 145 |
| 40 | -171 |
| 41 | 108 |
| 42 | 37 |
| 43 | -208 |
| 44 | 316 |
| 45 | -279 |
| 46 | 71 |
| 47 | 245 |
| 48 | -524 |
| 49 | 595 |