n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 22 |
6 | 130 |
7 | 822 |
8 | 6202 |
9 | 52552 |
10 | 499194 |
11 | 5238370 |
12 | 60222844 |
13 | 752587764 |
14 | 10157945044 |
15 | 147267180508 |
16 | 2282355168060 |
17 | 37655004171808 |
18 | 658906772228668 |
19 | 12188911634495388 |
20 | 237669544014377896 |
21 | 4871976826254018760 |
22 | 104742902332392298296 |
[1,0,1,1,6,22,130,822,6202,52552,499194,5238370, 60222844,752587764,10157945044,147267180508, 2282355168060,37655004171808,658906772228668, 12188911634495388,237669544014377896, 4871976826254018760,104742902332392298296] |