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A094168
as a simple table
n
a(n)
1
1
2
7
3
42
4
252
5
1505
6
8946
7
53165
8
315980
9
1878597
10
11171930
11
66456082
12
395399760
13
2352979538
14
14004512886
[1,7,42,252,1505,8946,53165,315980,1878597, 11171930,66456082,395399760,2352979538, 14004512886]