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 | -3 |
| 2 | 4 |
| 3 | -4 |
| 4 | 7 |
| 5 | -14 |
| 6 | 22 |
| 7 | -33 |
| 8 | 54 |
| 9 | -90 |
| 10 | 145 |
| 11 | -232 |
| 12 | 376 |
| 13 | -611 |
| 14 | 988 |
| 15 | -1596 |
| 16 | 2583 |
| 17 | -4182 |
| 18 | 6766 |
| 19 | -10945 |
| 20 | 17710 |
| 21 | -28658 |
| 22 | 46369 |
| 23 | -75024 |
| 24 | 121392 |
| 25 | -196419 |
| 26 | 317812 |
| 27 | -514228 |
| 28 | 832039 |
| 29 | -1346270 |
| 30 | 2178310 |
| 31 | -3524577 |
| 32 | 5702886 |
| 33 | -9227466 |
| 34 | 14930353 |
| 35 | -24157816 |
| 36 | 39088168 |
| 37 | -63245987 |
| 38 | 102334156 |
| 39 | -165580140 |