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 | -1 |
| 4 | 1 |
| 5 | 2 |
| 6 | -1 |
| 7 | -3 |
| 8 | -5 |
| 9 | 7 |
| 10 | -4 |
| 11 | -23 |
| 12 | 29 |
| 13 | 59 |
| 14 | 129 |
| 15 | -314 |
| 16 | -65 |
| 17 | 1529 |
| 18 | -3689 |
| 19 | -8209 |
| 20 | -16264 |
| 21 | 83313 |
| 22 | 113689 |
| 23 | -620297 |
| 24 | 2382785 |
| 25 | 7869898 |
| 26 | 7001471 |
| 27 | -126742987 |
| 28 | -398035821 |
| 29 | 1687054711 |
| 30 | -7911171596 |
| 31 | -47301104551 |
| 32 | 43244638645 |