n | a(n) |
---|---|
-1 | 0 |
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 32 |
5 | 126 |
6 | 588 |
7 | 3170 |
8 | 19384 |
9 | 132550 |
10 | 1002212 |
11 | 8301930 |
12 | 74767056 |
13 | 727348814 |
14 | 7601002876 |
15 | 84920459890 |
16 | 1010058659048 |
17 | 12742908917718 |
18 | 169962226236180 |
19 | 2389587638934650 |
20 | 35321010036943360 |
21 | 547577222471444062 |
[0,1,2,4,10,32,126,588,3170,19384,132550,1002212, 8301930,74767056,727348814,7601002876,84920459890, 1010058659048,12742908917718,169962226236180, 2389587638934650,35321010036943360, 547577222471444062] |