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A006525
as a simple table
n
a(n)
1
2
2
5
3
55
4
9999
5
3620211523
6
25838201785967533906
7
3408847366605453091140558218322023440765
[2,5,55,9999,3620211523,25838201785967533906, 3408847366605453091140558218322023440765]