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 | -1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 3 |
| 7 | -5 |
| 8 | -12 |
| 9 | 5 |
| 10 | 41 |
| 11 | 21 |
| 12 | -110 |
| 13 | -165 |
| 14 | 210 |
| 15 | 735 |
| 16 | -30 |
| 17 | -2505 |
| 18 | -2205 |
| 19 | 6555 |
| 20 | 13710 |
| 21 | -10035 |
| 22 | -57390 |
| 23 | -18471 |
| 24 | 185790 |
| 25 | 240793 |
| 26 | -436317 |
| 27 | -1276795 |
| 28 | 360302 |
| 29 | 4956495 |
| 30 | 3410749 |
| 31 | -14776581 |
| 32 | -26548200 |
| 33 | 28671609 |
| 34 | 124807175 |
| 35 | 14211153 |
| 36 | -446256722 |
| 37 | -481156685 |