n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 20 |
5 | 125 |
6 | 830 |
7 | 6001 |
8 | 45768 |
9 | 394553 |
10 | 3699418 |
11 | 38758909 |
12 | 433324828 |
13 | 5299232757 |
14 | 68428221654 |
15 | 958395448297 |
16 | 14101599762448 |
17 | 223667919165041 |
18 | 3706771205012274 |
19 | 65843651814440309 |
20 | 1215858569345385636 |
[0,1,2,5,20,125,830,6001,45768,394553,3699418, 38758909,433324828,5299232757,68428221654, 958395448297,14101599762448,223667919165041, 3706771205012274,65843651814440309, 1215858569345385636] |