n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 150 |
4 | 750 |
5 | 3750 |
6 | 18630 |
7 | 92406 |
8 | 458262 |
9 | 2270478 |
10 | 11245590 |
11 | 55697766 |
12 | 275769654 |
13 | 1365260862 |
14 | 6758345838 |
15 | 33450929886 |
16 | 165549052326 |
17 | 819248589606 |
18 | 4054005363918 |
[1,6,30,150,750,3750,18630,92406,458262,2270478, 11245590,55697766,275769654,1365260862,6758345838, 33450929886,165549052326,819248589606, 4054005363918] |