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A157250
as a simple table
n
a(n)
1
1
2
5
3
13
4
563
5
5971
6
558771
7
1964215
8
8121909
9
12326713
10
23025711
11
26921605
12
341569806
13
399292158
[1,5,13,563,5971,558771,1964215,8121909,12326713, 23025711,26921605,341569806,399292158]