n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 126 |
6 | 1296 |
7 | 9072 |
8 | 52488 |
9 | 297432 |
10 | 1700352 |
11 | 9843120 |
12 | 58576608 |
13 | 356638464 |
14 | 2176782336 |
15 | 13162730688 |
16 | 78940272384 |
17 | 471877757568 |
18 | 2821109907456 |
19 | 16894457846784 |
20 | 101361597378048 |
21 | 608764662139392 |
22 | 3656220357427200 |
23 | 21947909832446976 |
24 | 131685972252346368 |
[0,1,3,12,126,1296,9072,52488,297432,1700352, 9843120,58576608,356638464,2176782336,13162730688, 78940272384,471877757568,2821109907456, 16894457846784,101361597378048,608764662139392, 3656220357427200,21947909832446976, 131685972252346368] |