n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 13 |
5 | 49 |
6 | 132 |
7 | 433 |
8 | 1261 |
9 | 3942 |
10 | 11809 |
11 | 36289 |
12 | 109824 |
13 | 335425 |
14 | 1018849 |
15 | 3104934 |
16 | 9443629 |
17 | 28756657 |
18 | 87504516 |
19 | 266383153 |
20 | 810723277 |
21 | 2467770054 |
22 | 7510988353 |
23 | 22861948801 |
24 | 69584925696 |
25 | 211799836801 |
26 | 644660351425 |
[0,1,1,6,13,49,132,433,1261,3942,11809,36289, 109824,335425,1018849,3104934,9443629,28756657, 87504516,266383153,810723277,2467770054, 7510988353,22861948801,69584925696,211799836801, 644660351425] |