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A001537
as a simple table
n
a(n)
1
1
2
1
3
4
4
302
5
2569966041123963092
6
76230976900860740792605252293646252383143627390965685153124757864
[1,1,4,302,2569966041123963092, 76230976900860740792605252293646252383143627390965\ 685153124757864]