n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 36 |
5 | 135 |
6 | 432 |
7 | 1539 |
8 | 4860 |
9 | 17496 |
10 | 55404 |
11 | 192456 |
12 | 623295 |
13 | 2125764 |
14 | 6849684 |
15 | 23442453 |
16 | 75110328 |
17 | 252965916 |
18 | 822670668 |
19 | 2735858268 |
20 | 8838926712 |
21 | 29501352792 |
22 | 95090206689 |
23 | 314068876416 |
24 | 1018141045092 |
25 | 3342663979092 |
26 | 10798571289897 |
27 | 35481518064576 |
[1,1,3,12,36,135,432,1539,4860,17496,55404,192456, 623295,2125764,6849684,23442453,75110328, 252965916,822670668,2735858268,8838926712, 29501352792,95090206689,314068876416, 1018141045092,3342663979092,10798571289897, 35481518064576] |