n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 30 |
5 | 101 |
6 | 394 |
7 | 1760 |
8 | 8970 |
9 | 51368 |
10 | 326991 |
11 | 2289669 |
12 | 17491625 |
13 | 144760655 |
14 | 1290204758 |
15 | 12320541392 |
16 | 125496010615 |
17 | 1358185050788 |
18 | 15563654383395 |
19 | 188254471337718 |
20 | 2396930376564860 |
21 | 32044598671291610 |
[1,2,4,10,30,101,394,1760,8970,51368,326991, 2289669,17491625,144760655,1290204758,12320541392, 125496010615,1358185050788,15563654383395, 188254471337718,2396930376564860, 32044598671291610] |