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 | 0 |
| 4 | 2 |
| 5 | -3 |
| 6 | -1 |
| 7 | 11 |
| 8 | -15 |
| 9 | -13 |
| 10 | 77 |
| 11 | -86 |
| 12 | -144 |
| 13 | 595 |
| 14 | -495 |
| 15 | -1520 |
| 16 | 4810 |
| 17 | -2485 |
| 18 | -15675 |
| 19 | 39560 |
| 20 | -6290 |
| 21 | -159105 |
| 22 | 324805 |
| 23 | 87075 |
| 24 | -1592843 |
| 25 | 2616757 |
| 26 | 2136539 |
| 27 | -15726114 |
| 28 | 20247800 |
| 29 | 32296693 |
| 30 | -152909577 |
| 31 | 145139491 |
| 32 | 417959049 |
| 33 | -1460704685 |
| 34 | 885536173 |
| 35 | 4997618808 |
| 36 | -13658704994 |