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A002228
as a simple table
n
a(n)
1
331
2
39139
3
253243
4
4397207
5
21587171
6
781712537
7
781712537
8
25467966877
9
1304374210679
10
4331892405391
[331,39139,253243,4397207,21587171,781712537, 781712537,25467966877,1304374210679,4331892405391]