n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | -4 |
5 | 12 |
6 | -120 |
7 | 128 |
8 | -4464 |
9 | 6912 |
10 | -206880 |
11 | 776800 |
12 | -12788224 |
13 | 95713984 |
14 | -1101528064 |
15 | 13091780224 |
16 | -133871961344 |
17 | 2061579919104 |
18 | -22144979338752 |
19 | 381671021731840 |
20 | -4690276122840064 |
21 | 83860033272100864 |
[0,1,0,2,-4,12,-120,128,-4464,6912,-206880,776800, -12788224,95713984,-1101528064,13091780224, -133871961344,2061579919104,-22144979338752, 381671021731840,-4690276122840064, 83860033272100864] |