n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 22 |
6 | 57 |
7 | 157 |
8 | 453 |
9 | 1368 |
10 | 4296 |
11 | 13995 |
12 | 47138 |
13 | 163779 |
14 | 585741 |
15 | 2152349 |
16 | 8113188 |
17 | 31326760 |
18 | 123748871 |
19 | 499539900 |
20 | 2058542819 |
21 | 8651755865 |
22 | 37054078481 |
23 | 161591063250 |
24 | 717032333816 |
25 | 3235298221401 |
26 | 14834735654080 |
27 | 69085973044125 |
[1,1,2,4,9,22,57,157,453,1368,4296,13995,47138, 163779,585741,2152349,8113188,31326760,123748871, 499539900,2058542819,8651755865,37054078481, 161591063250,717032333816,3235298221401, 14834735654080,69085973044125] |