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A209071
as a simple table
n
a(n)
1
1
2
7
3
42
4
366
5
3378
6
33469
7
344618
8
3660116
9
39772437
10
440146892
11
4943305065
12
56200679500
13
645543627296
[1,7,42,366,3378,33469,344618,3660116,39772437, 440146892,4943305065,56200679500,645543627296]