n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 22 |
3 | 151 |
4 | 1051 |
5 | 7354 |
6 | 51472 |
7 | 360301 |
8 | 2522101 |
9 | 17654704 |
10 | 123582922 |
11 | 865080451 |
12 | 6055563151 |
13 | 42388942054 |
14 | 296722594372 |
15 | 2077058160601 |
16 | 14539407124201 |
17 | 101775849869404 |
18 | 712430949085822 |
19 | 4987016643600751 |
20 | 34909116505205251 |
[1,4,22,151,1051,7354,51472,360301,2522101, 17654704,123582922,865080451,6055563151, 42388942054,296722594372,2077058160601, 14539407124201,101775849869404,712430949085822, 4987016643600751,34909116505205251] |