n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 1 |
6 | 4 |
7 | 14 |
8 | 130 |
9 | 1981 |
10 | 62616 |
11 | 2806508 |
12 | 158937367 |
13 | 10773254138 |
14 | 855658147832 |
15 | 78558952717569 |
16 | 8251166899386729 |
17 | 982806390786806618 |
18 | 131756175056777580011 |
19 | 19748565975966429686408 |
20 | 3289970442222058710279611 |
21 | 605948437043760750748781907 |
22 | 122796504004669690100342096563 |
[0,0,0,1,1,4,14,130,1981,62616,2806508,158937367, 10773254138,855658147832,78558952717569, 8251166899386729,982806390786806618, 131756175056777580011,19748565975966429686408, 3289970442222058710279611, 605948437043760750748781907, 122796504004669690100342096563] |