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 | 0 |
| 3 | 2 |
| 4 | -3 |
| 5 | 0 |
| 6 | 5 |
| 7 | 0 |
| 8 | -21 |
| 9 | 14 |
| 10 | 117 |
| 11 | -342 |
| 12 | 210 |
| 13 | 935 |
| 14 | -2565 |
| 15 | 1864 |
| 16 | 2751 |
| 17 | -3945 |
| 18 | -8074 |
| 19 | 4046 |
| 20 | 108927 |
| 21 | -333832 |
| 22 | 246895 |
| 23 | 887040 |
| 24 | -2764795 |
| 25 | 3062749 |
| 26 | -1372098 |
| 27 | 4775900 |
| 28 | -9367698 |
| 29 | -55130625 |
| 30 | 299939766 |
| 31 | -537241936 |
| 32 | -140898285 |
| 33 | 2464380030 |
| 34 | -4060507784 |
| 35 | 193070394 |