n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | -1 |
3 | 5 |
4 | 28 |
5 | 724 |
6 | 36 |
7 | 220716 |
8 | -1255680 |
9 | 110979072 |
10 | 2530310400 |
11 | 1193835283200 |
12 | -24457819622400 |
13 | 21656019855744000 |
14 | 899271273253248000 |
15 | 474367063601421849600 |
16 | 45822442913828595302400 |
17 | 28365278076547150440038400 |
18 | 2614371018285307258994688000 |
[1,-1,-1,5,28,724,36,220716,-1255680,110979072, 2530310400,1193835283200,-24457819622400, 21656019855744000,899271273253248000, 474367063601421849600,45822442913828595302400, 28365278076547150440038400, 2614371018285307258994688000] |