n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 30 |
4 | 108 |
5 | 405 |
6 | 1548 |
7 | 5967 |
8 | 23085 |
9 | 89451 |
10 | 346842 |
11 | 1345248 |
12 | 5218263 |
13 | 20242872 |
14 | 78528609 |
15 | 304640595 |
16 | 1181814705 |
17 | 4584708702 |
18 | 17785841652 |
19 | 68998115709 |
20 | 267670245492 |
21 | 1038395956527 |
22 | 4028337876861 |
23 | 15627474388899 |
24 | 60624993311226 |
[1,3,9,30,108,405,1548,5967,23085,89451,346842, 1345248,5218263,20242872,78528609,304640595, 1181814705,4584708702,17785841652,68998115709, 267670245492,1038395956527,4028337876861, 15627474388899,60624993311226] |