n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 36 |
4 | 144 |
5 | 3600 |
6 | 3600 |
7 | 176400 |
8 | 2822400 |
9 | 25401600 |
10 | 25401600 |
11 | 3073593600 |
12 | 110649369600 |
13 | 18699743462400 |
14 | 74798973849600 |
15 | 1869974346240000 |
16 | 29919589539840000 |
17 | 8646761377013760000 |
18 | 77820852393123840000 |
19 | 28093327713917706240000 |
20 | 112373310855670824960000 |
[1,1,4,36,144,3600,3600,176400,2822400,25401600, 25401600,3073593600,110649369600,18699743462400, 74798973849600,1869974346240000,29919589539840000, 8646761377013760000,77820852393123840000, 28093327713917706240000,112373310855670824960000] |