n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 15 |
4 | 42 |
5 | 726 |
6 | 2906 |
7 | 84550 |
8 | 433252 |
9 | 18378580 |
10 | 113503692 |
11 | 6485270720 |
12 | 46538017584 |
13 | 3404551437592 |
14 | 27700815674032 |
15 | 2504332323669064 |
16 | 22702140562948192 |
17 | 2470653950084307472 |
18 | 24626774613248937584 |
[2,2,15,42,726,2906,84550,433252,18378580, 113503692,6485270720,46538017584,3404551437592, 27700815674032,2504332323669064,22702140562948192, 2470653950084307472,24626774613248937584] |