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 | -1 |
| 3 | 2 |
| 4 | -4 |
| 5 | 8 |
| 6 | -12 |
| 7 | 8 |
| 8 | 15 |
| 9 | -56 |
| 10 | 81 |
| 11 | -26 |
| 12 | -130 |
| 13 | 208 |
| 14 | 306 |
| 15 | -2060 |
| 16 | 4796 |
| 17 | -5120 |
| 18 | -6140 |
| 19 | 43320 |
| 20 | -113768 |
| 21 | 182720 |
| 22 | -111768 |
| 23 | -395696 |
| 24 | 1725172 |
| 25 | -3922016 |
| 26 | 5614348 |
| 27 | -2289912 |
| 28 | -14957416 |
| 29 | 56700032 |
| 30 | -121684568 |
| 31 | 164735504 |
| 32 | -47657969 |
| 33 | -491084768 |
| 34 | 1740799985 |
| 35 | -3598600386 |
| 36 | 4619098604 |