n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 31 |
4 | 185 |
5 | 1111 |
6 | 6665 |
7 | 39991 |
8 | 239945 |
9 | 1439671 |
10 | 8638025 |
11 | 51828151 |
12 | 310968905 |
13 | 1865813431 |
14 | 11194880585 |
15 | 67169283511 |
16 | 403015701065 |
17 | 2418094206391 |
18 | 14508565238345 |
19 | 87051391430071 |
20 | 522308348580425 |
[0,1,5,31,185,1111,6665,39991,239945,1439671, 8638025,51828151,310968905,1865813431,11194880585, 67169283511,403015701065,2418094206391, 14508565238345,87051391430071,522308348580425] |