n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | -2 |
3 | 6 |
4 | -28 |
5 | 160 |
6 | -936 |
7 | 4536 |
8 | -20448 |
9 | 627264 |
10 | -19699200 |
11 | 43908480 |
12 | 17788273920 |
13 | -211715112960 |
14 | -41219197125120 |
15 | 1301670191808000 |
16 | 160057006683033600 |
17 | -10037518414724505600 |
18 | -1007362871616478003200 |
[0,2,-2,6,-28,160,-936,4536,-20448,627264, -19699200,43908480,17788273920,-211715112960, -41219197125120,1301670191808000, 160057006683033600,-10037518414724505600, -1007362871616478003200] |