n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 4 |
3 | 32 |
4 | 128 |
5 | 1152 |
6 | 6912 |
7 | 73728 |
8 | 589824 |
9 | 7372800 |
10 | 73728000 |
11 | 1061683200 |
12 | 12740198400 |
13 | 208089907200 |
14 | 2913258700800 |
15 | 53271016243200 |
16 | 852336259891200 |
17 | 17259809262796800 |
18 | 310676566730342400 |
19 | 6903923705118720000 |
20 | 138078474102374400000 |
21 | 3341499073277460480000 |
[0,2,4,32,128,1152,6912,73728,589824,7372800, 73728000,1061683200,12740198400,208089907200, 2913258700800,53271016243200,852336259891200, 17259809262796800,310676566730342400, 6903923705118720000,138078474102374400000, 3341499073277460480000] |