n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 3 |
3 | 15 |
4 | 51 |
5 | 165 |
6 | 507 |
7 | 1551 |
8 | 4683 |
9 | 14127 |
10 | 42459 |
11 | 127599 |
12 | 383019 |
13 | 1149693 |
14 | 3449715 |
15 | 10351023 |
16 | 31054947 |
17 | 93170397 |
18 | 279516747 |
19 | 838566831 |
20 | 2515717083 |
21 | 7547200797 |
22 | 22641651939 |
23 | 67925104239 |
24 | 203775461139 |
25 | 611326828047 |
26 | 1833980928771 |
[0,0,3,15,51,165,507,1551,4683,14127,42459,127599, 383019,1149693,3449715,10351023,31054947,93170397, 279516747,838566831,2515717083,7547200797, 22641651939,67925104239,203775461139,611326828047, 1833980928771] |