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A080631
as a simple table
n
a(n)
0
1
1
1
2
5
3
25
4
215
5
1860
6
16481
7
144334
8
1242992
9
10324847
10
76993295
11
371975385
12
382690120
13
8235392
14
54
15
1
[1,1,5,25,215,1860,16481,144334,1242992,10324847, 76993295,371975385,382690120,8235392,54,1]