n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 6 |
6 | 16 |
7 | 43 |
8 | 120 |
9 | 339 |
10 | 985 |
11 | 2892 |
12 | 8606 |
13 | 25850 |
14 | 78347 |
15 | 239161 |
16 | 734922 |
17 | 2271085 |
18 | 7054235 |
19 | 22010418 |
20 | 68958139 |
21 | 216842102 |
22 | 684164551 |
23 | 2165240365 |
24 | 6871792256 |
25 | 21865189969 |
26 | 69737972975 |
27 | 222915760126 |
28 | 714001019626 |
29 | 2291298553660 |
30 | 7366035776888 |
[0,1,1,1,3,6,16,43,120,339,985,2892,8606,25850, 78347,239161,734922,2271085,7054235,22010418, 68958139,216842102,684164551,2165240365, 6871792256,21865189969,69737972975,222915760126, 714001019626,2291298553660,7366035776888] |