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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | -3 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | -18 |
| 11 | -18 |
| 12 | 24 |
| 13 | 0 |
| 14 | -171 |
| 15 | -162 |
| 16 | 153 |
| 17 | 252 |
| 18 | -1704 |
| 19 | -2106 |
| 20 | 1998 |
| 21 | 2586 |
| 22 | -14364 |
| 23 | -28098 |
| 24 | 19008 |
| 25 | 43020 |
| 26 | -147024 |
| 27 | -317304 |
| 28 | 125775 |
| 29 | 612954 |
| 30 | -1370868 |
| 31 | -3909528 |
| 32 | 907209 |
| 33 | 7487136 |
| 34 | -11849868 |
| 35 | -46762686 |
| 36 | 252159 |