n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 11 |
5 | 30 |
6 | 87 |
7 | 326 |
8 | 1384 |
9 | 6412 |
10 | 32253 |
11 | 175410 |
12 | 1018513 |
13 | 6293033 |
14 | 41087200 |
15 | 283470860 |
16 | 2066593574 |
17 | 15747134967 |
18 | 125214779885 |
19 | 1039530874036 |
20 | 8970143588253 |
21 | 80678526525259 |
22 | 749250973396318 |
23 | 7210243966377770 |
[1,2,4,11,30,87,326,1384,6412,32253,175410, 1018513,6293033,41087200,283470860,2066593574, 15747134967,125214779885,1039530874036, 8970143588253,80678526525259,749250973396318, 7210243966377770] |