n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 5 |
6 | 9 |
7 | 19 |
8 | 60 |
9 | 189 |
10 | 892 |
11 | 3177 |
12 | 18960 |
13 | 89571 |
14 | 754227 |
15 | 4905159 |
16 | 53337014 |
17 | 466215312 |
18 | 6729449504 |
19 | 78188089715 |
20 | 1533329125669 |
[1,1,1,3,5,9,19,60,189,892,3177,18960,89571, 754227,4905159,53337014,466215312,6729449504, 78188089715,1533329125669] |