n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | -4 |
4 | 20 |
5 | -100 |
6 | 620 |
7 | -4420 |
8 | 35900 |
9 | -326980 |
10 | 3301820 |
11 | -36614980 |
12 | 442386620 |
13 | -5784634180 |
14 | 81393657020 |
15 | -1226280710980 |
16 | 19696509177020 |
17 | -335990918918980 |
18 | 6066382786809020 |
19 | -115578717622022980 |
20 | 2317323290554617020 |
21 | -48773618881154822980 |
[1,0,2,-4,20,-100,620,-4420,35900,-326980,3301820, -36614980,442386620,-5784634180,81393657020, -1226280710980,19696509177020,-335990918918980, 6066382786809020,-115578717622022980, 2317323290554617020,-48773618881154822980] |