n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 36 |
5 | 380 |
6 | 3630 |
7 | 47082 |
8 | 725816 |
9 | 12132360 |
10 | 235801530 |
11 | 5083309550 |
12 | 119757623172 |
13 | 3103443520476 |
14 | 87082536196838 |
15 | 2632399338834930 |
16 | 85471932351187440 |
17 | 2961803643600574352 |
18 | 109154615479427298546 |
19 | 4264407640037365789014 |
20 | 175984871341042826680700 |
[1,0,2,6,36,380,3630,47082,725816,12132360, 235801530,5083309550,119757623172,3103443520476, 87082536196838,2632399338834930,85471932351187440, 2961803643600574352,109154615479427298546, 4264407640037365789014,175984871341042826680700] |