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A114928
as a simple table
n
a(n)
1
42
2
402
3
492
4
4000002
5
57906504
6
400000002
7
4000000002
8
6279090751
9
62698513951
10
400000000002
[42,402,492,4000002,57906504,400000002,4000000002, 6279090751,62698513951,400000000002]