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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 1 |
| 6 | 0 |
| 7 | -1 |
| 8 | 1 |
| 9 | 2 |
| 10 | -3 |
| 11 | -2 |
| 12 | 5 |
| 13 | 1 |
| 14 | -6 |
| 15 | 1 |
| 16 | 8 |
| 17 | -6 |
| 18 | -10 |
| 19 | 14 |
| 20 | 7 |
| 21 | -25 |
| 22 | 8 |
| 23 | 36 |
| 24 | -34 |
| 25 | -41 |
| 26 | 72 |
| 27 | 25 |
| 28 | -125 |
| 29 | 29 |
| 30 | 187 |
| 31 | -150 |
| 32 | -216 |
| 33 | 361 |
| 34 | 137 |
| 35 | -657 |
| 36 | 159 |
| 37 | 977 |
| 38 | -810 |
| 39 | -1135 |
| 40 | 1937 |
| 41 | 752 |
| 42 | -3558 |
| 43 | 792 |
| 44 | 5361 |
| 45 | -4327 |
| 46 | -6318 |
| 47 | 10641 |
| 48 | 4281 |
| 49 | -19848 |
| 50 | 4286 |