n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 6 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 5040 |
8 | 80640 |
9 | 725760 |
10 | 7257600 |
11 | 79833600 |
12 | 1437004800 |
13 | 18681062400 |
14 | 261534873600 |
15 | 5230697472000 |
16 | 104613949440000 |
17 | 1778437140480000 |
18 | 32011868528640000 |
19 | 729870602452992000 |
20 | 17030314057236480000 |
21 | 408727537373675520000 |
22 | 8992005822220861440000 |
[1,1,0,6,24,120,720,5040,80640,725760,7257600, 79833600,1437004800,18681062400,261534873600, 5230697472000,104613949440000,1778437140480000, 32011868528640000,729870602452992000, 17030314057236480000,408727537373675520000, 8992005822220861440000] |