n | a(n) |
---|---|
1 | 2 |
2 | 18 |
3 | 180 |
4 | 864 |
5 | 4608 |
6 | 29040 |
7 | 184525 |
8 | 1089000 |
9 | 6480000 |
10 | 39335400 |
11 | 238918849 |
12 | 1439151168 |
13 | 8674025472 |
14 | 52415185536 |
15 | 316746710820 |
16 | 1912128349230 |
17 | 11543580054050 |
18 | 69713595928295 |
19 | 421013268028981 |
20 | 2542224621830400 |
[2,18,180,864,4608,29040,184525,1089000,6480000, 39335400,238918849,1439151168,8674025472, 52415185536,316746710820,1912128349230, 11543580054050,69713595928295,421013268028981, 2542224621830400] |