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 | 2 |
| 2 | -1 |
| 3 | 5 |
| 4 | -2 |
| 5 | 8 |
| 6 | -5 |
| 7 | 21 |
| 8 | -8 |
| 9 | 34 |
| 10 | -21 |
| 11 | 81 |
| 12 | -34 |
| 13 | 128 |
| 14 | -81 |
| 15 | 337 |
| 16 | -128 |
| 17 | 546 |
| 18 | -337 |
| 19 | 1301 |
| 20 | -546 |
| 21 | 2056 |
| 22 | -1301 |
| 23 | 5381 |
| 24 | -2056 |
| 25 | 8706 |
| 26 | -5381 |
| 27 | 20737 |
| 28 | -8706 |
| 29 | 32768 |
| 30 | -20737 |
| 31 | 86273 |
| 32 | -32768 |
| 33 | 139778 |
| 34 | -86273 |
| 35 | 333061 |
| 36 | -139778 |
| 37 | 526344 |
| 38 | -333061 |
| 39 | 1377557 |
| 40 | -526344 |
| 41 | 2228770 |