n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 20 |
4 | 125 |
5 | 952 |
6 | 8494 |
7 | 86025 |
8 | 969862 |
9 | 12020580 |
10 | 162203607 |
11 | 2363458396 |
12 | 36930606254 |
13 | 615302885459 |
14 | 10878670826170 |
15 | 203268056115256 |
16 | 3999642836434361 |
17 | 82617423216826640 |
18 | 1786559190116778030 |
19 | 40344863179696283037 |
20 | 949348461372003462390 |
[1,1,4,20,125,952,8494,86025,969862,12020580, 162203607,2363458396,36930606254,615302885459, 10878670826170,203268056115256,3999642836434361, 82617423216826640,1786559190116778030, 40344863179696283037,949348461372003462390] |