n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 24 |
5 | 180 |
6 | 1440 |
7 | 12600 |
8 | 120960 |
9 | 1270080 |
10 | 14515200 |
11 | 179625600 |
12 | 2634508800 |
13 | 37362124800 |
14 | 566658892800 |
15 | 9807557760000 |
16 | 167382319104000 |
17 | 3023343138816000 |
18 | 57621363351552000 |
19 | 1155628453883904000 |
20 | 25545471085854720000 |
21 | 587545834974658560000 |
22 | 13488008733331292160000 |
[0,0,3,24,180,1440,12600,120960,1270080,14515200, 179625600,2634508800,37362124800,566658892800, 9807557760000,167382319104000,3023343138816000, 57621363351552000,1155628453883904000, 25545471085854720000,587545834974658560000, 13488008733331292160000] |