n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 6 |
5 | 14 |
6 | 40 |
7 | 56 |
8 | 100 |
9 | 2988 |
10 | 13200 |
11 | 805600 |
12 | 1323000 |
13 | 1744790520 |
14 | 112326337200 |
15 | 10154793943770044128560 |
16 | 26773964343922343708160 |
17 | 185027354760601080 |
18 | 1418008957437634586640 |
[1,2,4,6,14,40,56,100,2988,13200,805600,1323000, 1744790520,112326337200,10154793943770044128560, 26773964343922343708160,185027354760601080, 1418008957437634586640] |