n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 68 |
6 | 483 |
7 | 3946 |
8 | 34485 |
9 | 315810 |
10 | 2984570 |
11 | 28907970 |
12 | 285601251 |
13 | 2868869733 |
14 | 29227904840 |
15 | 301430074416 |
16 | 3141985563575 |
17 | 33059739636198 |
18 | 350763452126835 |
19 | 3749420616902637 |
20 | 40348040718155170 |
21 | 436827335493148600 |
[1,1,3,12,68,483,3946,34485,315810,2984570, 28907970,285601251,2868869733,29227904840, 301430074416,3141985563575,33059739636198, 350763452126835,3749420616902637, 40348040718155170,436827335493148600] |