n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 12 |
5 | 130 |
6 | 1500 |
7 | 18935 |
8 | 262248 |
9 | 3972612 |
10 | 65500200 |
11 | 1169398065 |
12 | 22494463860 |
13 | 464072915878 |
14 | 10225330604580 |
15 | 239720548513355 |
16 | 5959152063448080 |
17 | 156592569864940040 |
18 | 4337574220496785680 |
19 | 126329273251232688069 |
20 | 3859509516112803668220 |
21 | 123426111134706786806890 |
[0,0,1,12,130,1500,18935,262248,3972612,65500200, 1169398065,22494463860,464072915878, 10225330604580,239720548513355,5959152063448080, 156592569864940040,4337574220496785680, 126329273251232688069,3859509516112803668220, 123426111134706786806890] |