n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 115 |
9 | 286 |
10 | 719 |
11 | 1842 |
12 | 4766 |
13 | 12485 |
14 | 32969 |
15 | 87795 |
16 | 235326 |
17 | 634664 |
18 | 1720573 |
19 | 4686829 |
20 | 12820504 |
21 | 35204254 |
22 | 97001655 |
23 | 268120807 |
24 | 743236814 |
25 | 2065709551 |
26 | 5755253457 |
[1,1,2,4,9,20,48,115,286,719,1842,4766,12485, 32969,87795,235326,634664,1720573,4686829, 12820504,35204254,97001655,268120807,743236814, 2065709551,5755253457] |