n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 20 |
6 | 480 |
7 | 10560 |
8 | 272640 |
9 | 8709120 |
10 | 280627200 |
11 | 10644480000 |
12 | 439404134400 |
13 | 18781972070400 |
14 | 873535419187200 |
15 | 45751167221760000 |
16 | 2665172872986624000 |
17 | 160281737951182848000 |
18 | 10593163661832880128000 |
[0,0,0,0,1,20,480,10560,272640,8709120,280627200, 10644480000,439404134400,18781972070400, 873535419187200,45751167221760000, 2665172872986624000,160281737951182848000, 10593163661832880128000] |