n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 56 |
6 | 167 |
7 | 487 |
8 | 1411 |
9 | 4047 |
10 | 11527 |
11 | 32617 |
12 | 91790 |
13 | 257065 |
14 | 716896 |
15 | 1991792 |
16 | 5515535 |
17 | 15227846 |
18 | 41930133 |
19 | 115176023 |
20 | 315676425 |
21 | 863475561 |
22 | 2357539227 |
23 | 6425887551 |
24 | 17487572124 |
25 | 47522431681 |
26 | 128969086382 |
27 | 349567320762 |
[1,2,6,19,56,167,487,1411,4047,11527,32617,91790, 257065,716896,1991792,5515535,15227846,41930133, 115176023,315676425,863475561,2357539227, 6425887551,17487572124,47522431681,128969086382, 349567320762] |