n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | -2 |
4 | 14 |
5 | -6 |
6 | -406 |
7 | 2220 |
8 | 13768 |
9 | -280224 |
10 | 501824 |
11 | 34875600 |
12 | -394160416 |
13 | -3296452368 |
14 | 129418793776 |
15 | -532969950240 |
16 | -35512135858048 |
17 | 654965382945408 |
18 | 5943454902108032 |
19 | -395494767434053632 |
20 | 2913398252129581312 |
[0,1,-1,-2,14,-6,-406,2220,13768,-280224,501824, 34875600,-394160416,-3296452368,129418793776, -532969950240,-35512135858048,654965382945408, 5943454902108032,-395494767434053632, 2913398252129581312] |