n | a(n) |
---|---|
2 | 1 |
3 | 5 |
4 | 28 |
5 | 180 |
6 | 1320 |
7 | 10920 |
8 | 100800 |
9 | 1028160 |
10 | 11491200 |
11 | 139708800 |
12 | 1836172800 |
13 | 25945920000 |
14 | 392302310400 |
15 | 6320426112000 |
16 | 108101081088000 |
17 | 1956280854528000 |
18 | 37347179950080000 |
19 | 750144785854464000 |
20 | 15813863053148160000 |
21 | 349121438173347840000 |
[1,5,28,180,1320,10920,100800,1028160,11491200, 139708800,1836172800,25945920000,392302310400, 6320426112000,108101081088000,1956280854528000, 37347179950080000,750144785854464000, 15813863053148160000,349121438173347840000] |