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A057572
as a simple table
n
a(n)
2
1
3
1
4
12
5
148
6
3150
7
90075
8
3431015
9
167013000
10
10129020300
[1,1,12,148,3150,90075,3431015,167013000, 10129020300]
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Last modified April 24 12:22 EDT 2024. Contains 371937 sequences. (Running on oeis4.)