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A216029
as a simple table
n
a(n)
1
2
2
42
3
1534
4
167130
5
30312074
6
10311562327
7
4761748786964
8
3439948243132701
[2,42,1534,167130,30312074,10311562327, 4761748786964,3439948243132701]