n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 16 |
4 | 69 |
5 | 319 |
6 | 1440 |
7 | 6553 |
8 | 29739 |
9 | 135088 |
10 | 613437 |
11 | 2785927 |
12 | 12651840 |
13 | 57457009 |
14 | 260933907 |
15 | 1185000784 |
16 | 5381539701 |
17 | 24439624591 |
18 | 110989651680 |
19 | 504046327177 |
20 | 2289066543291 |
21 | 10395523920112 |
22 | 47210037563373 |
[0,1,3,16,69,319,1440,6553,29739,135088,613437, 2785927,12651840,57457009,260933907,1185000784, 5381539701,24439624591,110989651680,504046327177, 2289066543291,10395523920112,47210037563373] |