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A370115
as a simple table
n
a(n)
1
0
2
1
3
2
4
10
5
15
6
161
7
2189
8
5005
9
27030
10
29861
11
510221
12
223092341
[0,1,2,10,15,161,2189,5005,27030,29861,510221, 223092341]