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A162095
as a simple table
n
a(n)
1
2
2
3
3
9
4
48
5
438
6
6377
7
126669
8
3292900
9
104320191
10
3946694150
11
175609255247
12
9053540315118
13
533880519494913
[2,3,9,48,438,6377,126669,3292900,104320191, 3946694150,175609255247,9053540315118, 533880519494913]