n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 54 |
4 | 252 |
5 | 1188 |
6 | 5616 |
7 | 26568 |
8 | 125712 |
9 | 594864 |
10 | 2814912 |
11 | 13320288 |
12 | 63032256 |
13 | 298271808 |
14 | 1411437312 |
15 | 6678993024 |
16 | 31605334272 |
17 | 149558047488 |
18 | 707716279296 |
19 | 3348949390848 |
20 | 15847398669312 |
21 | 74990695670784 |
22 | 354859782008832 |
[1,3,12,54,252,1188,5616,26568,125712,594864, 2814912,13320288,63032256,298271808,1411437312, 6678993024,31605334272,149558047488,707716279296, 3348949390848,15847398669312,74990695670784, 354859782008832] |