n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 0 |
8 | 5040 |
9 | 362880 |
10 | 18144000 |
11 | 804988800 |
12 | 34488115200 |
13 | 1482082842240 |
14 | 65120246231040 |
15 | 2955402450000000 |
16 | 139297568464454400 |
17 | 6837892496270035200 |
18 | 350034595015623598080 |
19 | 18692451288585606954240 |
20 | 1041114148173066240000000 |
[1,0,0,0,0,0,0,0,5040,362880,18144000,804988800, 34488115200,1482082842240,65120246231040, 2955402450000000,139297568464454400, 6837892496270035200,350034595015623598080, 18692451288585606954240,1041114148173066240000000] |