n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 31 |
6 | 126 |
7 | 1009 |
8 | 3933 |
9 | 31428 |
10 | 512187 |
11 | 4017316 |
12 | 64213559 |
13 | 2090787507 |
14 | 32776879657 |
15 | 1046731134966 |
16 | 68125822829775 |
17 | 2134091162950790 |
18 | 136215005250379929 |
19 | 17716724971218816648 |
20 | 1109196056459852373561 |
[1,2,2,4,16,31,126,1009,3933,31428,512187,4017316, 64213559,2090787507,32776879657,1046731134966, 68125822829775,2134091162950790, 136215005250379929,17716724971218816648, 1109196056459852373561] |