n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 16 |
3 | 99 |
4 | 681 |
5 | 4950 |
6 | 37303 |
7 | 288399 |
8 | 2272318 |
9 | 18167553 |
10 | 146950227 |
11 | 1199921310 |
12 | 9875193549 |
13 | 81811617237 |
14 | 681621711306 |
15 | 5706874227051 |
16 | 47985527200311 |
17 | 405002888376840 |
18 | 3429714479025247 |
19 | 29130993220171449 |
20 | 248095567594494634 |
21 | 2118053534177686959 |
22 | 18122259456592141785 |
[1,3,16,99,681,4950,37303,288399,2272318,18167553, 146950227,1199921310,9875193549,81811617237, 681621711306,5706874227051,47985527200311, 405002888376840,3429714479025247, 29130993220171449,248095567594494634, 2118053534177686959,18122259456592141785] |