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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | -2 |
| 4 | 3 |
| 5 | 1 |
| 6 | -8 |
| 7 | 13 |
| 8 | -3 |
| 9 | -26 |
| 10 | 55 |
| 11 | -35 |
| 12 | -72 |
| 13 | 217 |
| 14 | -215 |
| 15 | -146 |
| 16 | 795 |
| 17 | -1079 |
| 18 | -8 |
| 19 | 2677 |
| 20 | -4827 |
| 21 | 2134 |
| 22 | 8047 |
| 23 | -19835 |
| 24 | 16056 |
| 25 | 19873 |
| 26 | -75599 |
| 27 | 87838 |
| 28 | 27507 |
| 29 | -266543 |
| 30 | 414712 |
| 31 | -93155 |
| 32 | -854643 |
| 33 | 1777222 |
| 34 | -1108889 |
| 35 | -2377619 |
| 36 | 7040952 |
| 37 | -6881111 |
| 38 | -4915079 |
| 39 | 25878094 |
| 40 | -34725237 |
| 41 | -983015 |