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A058010
as a simple table
n
a(n)
1
2
2
17
3
179
4
2221
5
27457
6
506683
7
14161729
8
368345293
9
9672485827
10
318083817907
11
12695664159413
[2,17,179,2221,27457,506683,14161729,368345293, 9672485827,318083817907,12695664159413]