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A093187
as a simple table
n
a(n)
1
0
2
1
3
10
4
53
5
390
6
2794
7
21215
8
167055
9
1347999
10
11084015
11
92708718
12
786663767
13
6757618852
[0,1,10,53,390,2794,21215,167055,1347999,11084015, 92708718,786663767,6757618852]