n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 3 |
3 | -15 |
4 | 81 |
5 | -585 |
6 | 4995 |
7 | -46935 |
8 | 499905 |
9 | -6109425 |
10 | 79791075 |
11 | -1138096575 |
12 | 17774982225 |
13 | -294439570425 |
14 | 5240530570275 |
15 | -100050497922375 |
16 | 2002010508122625 |
17 | -42495475420022625 |
18 | 954152290944727875 |
[1,-1,3,-15,81,-585,4995,-46935,499905,-6109425, 79791075,-1138096575,17774982225,-294439570425, 5240530570275,-100050497922375,2002010508122625, -42495475420022625,954152290944727875] |