n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 24 |
5 | 66 |
6 | 187 |
7 | 529 |
8 | 1506 |
9 | 4312 |
10 | 12394 |
11 | 35742 |
12 | 103377 |
13 | 299745 |
14 | 871011 |
15 | 2535873 |
16 | 7395522 |
17 | 21600720 |
18 | 63176964 |
19 | 185004852 |
20 | 542365407 |
21 | 1591631595 |
22 | 4675170690 |
23 | 13744341390 |
24 | 40438307599 |
25 | 119063564395 |
26 | 350799321531 |
[1,1,3,9,24,66,187,529,1506,4312,12394,35742, 103377,299745,871011,2535873,7395522,21600720, 63176964,185004852,542365407,1591631595, 4675170690,13744341390,40438307599,119063564395, 350799321531] |