n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 23 |
5 | 106 |
6 | 567 |
7 | 3434 |
8 | 23137 |
9 | 171174 |
10 | 1376525 |
11 | 11934581 |
12 | 110817423 |
13 | 1095896195 |
14 | 11487974708 |
15 | 127137087319 |
16 | 1480232557526 |
17 | 18075052037054 |
18 | 230855220112093 |
19 | 3076513227516437 |
20 | 42686898298650967 |
21 | 615457369662333260 |
[1,1,2,6,23,106,567,3434,23137,171174,1376525, 11934581,110817423,1095896195,11487974708, 127137087319,1480232557526,18075052037054, 230855220112093,3076513227516437, 42686898298650967,615457369662333260] |