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 | 2 |
| 3 | -1 |
| 4 | 4 |
| 5 | -4 |
| 6 | 9 |
| 7 | -12 |
| 8 | 22 |
| 9 | -33 |
| 10 | 56 |
| 11 | -88 |
| 12 | 145 |
| 13 | -232 |
| 14 | 378 |
| 15 | -609 |
| 16 | 988 |
| 17 | -1596 |
| 18 | 2585 |
| 19 | -4180 |
| 20 | 6766 |
| 21 | -10945 |
| 22 | 17712 |
| 23 | -28656 |
| 24 | 46369 |
| 25 | -75024 |
| 26 | 121394 |
| 27 | -196417 |
| 28 | 317812 |
| 29 | -514228 |
| 30 | 832041 |
| 31 | -1346268 |
| 32 | 2178310 |
| 33 | -3524577 |
| 34 | 5702888 |
| 35 | -9227464 |
| 36 | 14930353 |
| 37 | -24157816 |
| 38 | 39088170 |