n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 18 |
6 | 110 |
7 | 795 |
8 | 6489 |
9 | 59332 |
10 | 600732 |
11 | 6674805 |
12 | 80765135 |
13 | 1057289046 |
14 | 14890154058 |
15 | 224497707343 |
16 | 3607998868005 |
17 | 61576514013960 |
18 | 1112225784377144 |
19 | 21197714949305577 |
20 | 425131949816628507 |
21 | 8950146311929021210 |
[0,0,1,3,18,110,795,6489,59332,600732,6674805, 80765135,1057289046,14890154058,224497707343, 3607998868005,61576514013960,1112225784377144, 21197714949305577,425131949816628507, 8950146311929021210] |