n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 126 |
4 | 1782 |
5 | 42471 |
6 | 1706562 |
7 | 115640460 |
8 | 13216815036 |
9 | 2548124192970 |
10 | 828751754742975 |
11 | 454739496669274500 |
12 | 420972227408592675000 |
13 | 657522745057190417409000 |
14 | 1732789066323343611643088400 |
15 | 7704900186426840030325195822560 |
16 | 57807195523790513335568376591463776 |
[1,3,15,126,1782,42471,1706562,115640460, 13216815036,2548124192970,828751754742975, 454739496669274500,420972227408592675000, 657522745057190417409000, 1732789066323343611643088400, 7704900186426840030325195822560, 57807195523790513335568376591463776] |