n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | -1 |
3 | 3 |
4 | -6 |
5 | 23 |
6 | -90 |
7 | 91 |
8 | 2520 |
9 | -37549 |
10 | 453600 |
11 | -4950539 |
12 | 46054008 |
13 | -322939255 |
14 | 209249040 |
15 | 58871058247 |
16 | -1726916711520 |
17 | 36675055548935 |
18 | -665460508297536 |
19 | 10471928861164609 |
20 | -129836456400150520 |
[0,0,-1,3,-6,23,-90,91,2520,-37549,453600, -4950539,46054008,-322939255,209249040, 58871058247,-1726916711520,36675055548935, -665460508297536,10471928861164609, -129836456400150520] |