n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 30 |
3 | 180 |
4 | 1300 |
5 | 8736 |
6 | 60333 |
7 | 412335 |
8 | 2829310 |
9 | 19384200 |
10 | 132882696 |
11 | 910735488 |
12 | 6242420665 |
13 | 42785803515 |
14 | 293259265950 |
15 | 2010026277756 |
16 | 13776931957468 |
17 | 94428478367520 |
18 | 647222466507045 |
19 | 4436128656563175 |
20 | 30405678471399166 |
[1,3,30,180,1300,8736,60333,412335,2829310, 19384200,132882696,910735488,6242420665, 42785803515,293259265950,2010026277756, 13776931957468,94428478367520,647222466507045, 4436128656563175,30405678471399166] |