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A003090
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
2
6
12
7
147
8
283657
9
19270853541
10
34817397894749939
11
2036029552582883134196099
[1,1,1,2,2,12,147,283657,19270853541, 34817397894749939,2036029552582883134196099]