n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 17 |
4 | 83 |
5 | 432 |
6 | 2416 |
7 | 14093 |
8 | 85188 |
9 | 528234 |
10 | 3343420 |
11 | 21508182 |
12 | 140225532 |
13 | 924444270 |
14 | 6152191399 |
15 | 41275242100 |
16 | 278865583963 |
17 | 1895686831203 |
18 | 12956648332412 |
19 | 88984197144487 |
20 | 613773294727307 |
21 | 4250024962493357 |
[1,4,17,83,432,2416,14093,85188,528234,3343420, 21508182,140225532,924444270,6152191399, 41275242100,278865583963,1895686831203, 12956648332412,88984197144487,613773294727307, 4250024962493357] |