n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 9 |
6 | 22 |
7 | 71 |
8 | 217 |
9 | 729 |
10 | 2438 |
11 | 8440 |
12 | 29414 |
13 | 104138 |
14 | 371516 |
15 | 1337649 |
16 | 4847637 |
17 | 17680265 |
18 | 64823110 |
19 | 238824212 |
20 | 883634026 |
[1,1,1,2,3,9,22,71,217,729,2438,8440,29414,104138, 371516,1337649,4847637,17680265,64823110, 238824212,883634026] |