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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -1 |
| 5 | 3 |
| 6 | -5 |
| 7 | 9 |
| 8 | -15 |
| 9 | 25 |
| 10 | -41 |
| 11 | 67 |
| 12 | -109 |
| 13 | 177 |
| 14 | -287 |
| 15 | 465 |
| 16 | -753 |
| 17 | 1219 |
| 18 | -1973 |
| 19 | 3193 |
| 20 | -5167 |
| 21 | 8361 |
| 22 | -13529 |
| 23 | 21891 |
| 24 | -35421 |
| 25 | 57313 |
| 26 | -92735 |
| 27 | 150049 |
| 28 | -242785 |
| 29 | 392835 |
| 30 | -635621 |
| 31 | 1028457 |
| 32 | -1664079 |
| 33 | 2692537 |
| 34 | -4356617 |
| 35 | 7049155 |
| 36 | -11405773 |
| 37 | 18454929 |