n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 7 |
7 | 21 |
8 | 53 |
9 | 267 |
10 | 1477 |
11 | 11799 |
12 | 115813 |
13 | 1314119 |
14 | 18659927 |
15 | 340219403 |
16 | 7888629683 |
17 | 233265020067 |
18 | 8619893688875 |
19 | 395425329029435 |
20 | 22778671927694919 |
21 | 1657248108130816043 |
[1,1,1,1,1,7,21,53,267,1477,11799,115813,1314119, 18659927,340219403,7888629683,233265020067, 8619893688875,395425329029435,22778671927694919, 1657248108130816043] |