n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 36 |
4 | 576 |
5 | 12800 |
6 | 360000 |
7 | 12192768 |
8 | 481890304 |
9 | 21743271936 |
10 | 1101996057600 |
11 | 61952000000000 |
12 | 3824628881965056 |
13 | 257164113195565056 |
14 | 18704075505689706496 |
15 | 1462975070062038220800 |
16 | 122444006400000000000000 |
17 | 10918111308394619734065152 |
18 | 1033255398127440061257744384 |
[1,1,4,36,576,12800,360000,12192768,481890304, 21743271936,1101996057600,61952000000000, 3824628881965056,257164113195565056, 18704075505689706496,1462975070062038220800, 122444006400000000000000, 10918111308394619734065152, 1033255398127440061257744384] |