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A099409
as a simple table
n
a(n)
1
0
2
1
3
3
4
9
5
15
6
28
7
64
8
1168
9
1695
10
2362
11
116620
12
336405
[0,1,3,9,15,28,64,1168,1695,2362,116620,336405]