n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 1 |
3 | -3 |
4 | 3 |
5 | -15 |
6 | 15 |
7 | -105 |
8 | 105 |
9 | -945 |
10 | 945 |
11 | -10395 |
12 | 10395 |
13 | -135135 |
14 | 135135 |
15 | -2027025 |
16 | 2027025 |
17 | -34459425 |
18 | 34459425 |
19 | -654729075 |
20 | 654729075 |
21 | -13749310575 |
22 | 13749310575 |
23 | -316234143225 |
24 | 316234143225 |
25 | -7905853580625 |
26 | 7905853580625 |
27 | -213458046676875 |
28 | 213458046676875 |
[1,-1,1,-3,3,-15,15,-105,105,-945,945,-10395, 10395,-135135,135135,-2027025,2027025,-34459425, 34459425,-654729075,654729075,-13749310575, 13749310575,-316234143225,316234143225, -7905853580625,7905853580625,-213458046676875, 213458046676875] |