n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 7 |
4 | 45 |
5 | 313 |
6 | 2421 |
7 | 20833 |
8 | 198309 |
9 | 2073793 |
10 | 23664021 |
11 | 292834513 |
12 | 3907994949 |
13 | 55967406433 |
14 | 856355084661 |
15 | 13944569166193 |
16 | 240803714700069 |
17 | 4395998055854593 |
18 | 84596337986326101 |
19 | 1711691067680320273 |
20 | 36329581765125539589 |
21 | 807099012174816776353 |
[0,1,7,45,313,2421,20833,198309,2073793,23664021, 292834513,3907994949,55967406433,856355084661, 13944569166193,240803714700069,4395998055854593, 84596337986326101,1711691067680320273, 36329581765125539589,807099012174816776353] |