n | a(n) |
---|---|
0 | 1 |
1 | -10 |
2 | 30 |
3 | -20 |
4 | -10 |
5 | -12 |
6 | -20 |
7 | -40 |
8 | -90 |
9 | -220 |
10 | -572 |
11 | -1560 |
12 | -4420 |
13 | -12920 |
14 | -38760 |
15 | -118864 |
16 | -371450 |
17 | -1179900 |
18 | -3801900 |
19 | -12406200 |
20 | -40940460 |
21 | -136468200 |
22 | -459029400 |
23 | -1556708400 |
24 | -5318753700 |
25 | -18296512728 |
26 | -63334082520 |
[1,-10,30,-20,-10,-12,-20,-40,-90,-220,-572,-1560, -4420,-12920,-38760,-118864,-371450,-1179900, -3801900,-12406200,-40940460,-136468200, -459029400,-1556708400,-5318753700,-18296512728, -63334082520] |