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A059305
as a simple table
n
a(n)
1
2
2
4
3
11
4
31
5
1028
6
12251
7
43390
8
105097565
9
55890484045084135
10
10201730804263125133012340
[2,4,11,31,1028,12251,43390,105097565, 55890484045084135,10201730804263125133012340]