n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 29 |
5 | 140 |
6 | 757 |
7 | 4858 |
8 | 36409 |
9 | 302520 |
10 | 2681769 |
11 | 25018510 |
12 | 245905365 |
13 | 2559272196 |
14 | 28264854685 |
15 | 330408571202 |
16 | 4065526003313 |
17 | 52349977261040 |
18 | 702393407898705 |
19 | 9795673312888214 |
20 | 141820637175889805 |
[1,0,1,6,29,140,757,4858,36409,302520,2681769, 25018510,245905365,2559272196,28264854685, 330408571202,4065526003313,52349977261040, 702393407898705,9795673312888214, 141820637175889805] |