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 | 1 |
| 2 | 2 |
| 3 | 1 |
| 4 | 3 |
| 5 | 0 |
| 6 | 5 |
| 7 | -3 |
| 8 | 10 |
| 9 | -11 |
| 10 | 23 |
| 11 | -32 |
| 12 | 57 |
| 13 | -87 |
| 14 | 146 |
| 15 | -231 |
| 16 | 379 |
| 17 | -608 |
| 18 | 989 |
| 19 | -1595 |
| 20 | 2586 |
| 21 | -4179 |
| 22 | 6767 |
| 23 | -10944 |
| 24 | 17713 |
| 25 | -28655 |
| 26 | 46370 |
| 27 | -75023 |
| 28 | 121395 |
| 29 | -196416 |
| 30 | 317813 |
| 31 | -514227 |
| 32 | 832042 |
| 33 | -1346267 |
| 34 | 2178311 |
| 35 | -3524576 |
| 36 | 5702889 |
| 37 | -9227463 |
| 38 | 14930354 |
| 39 | -24157815 |
| 40 | 39088171 |
| 41 | -63245984 |
| 42 | 102334157 |