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A098739
as a simple table
n
a(n)
1
2
2
23
3
235
4
2357
5
23572
6
235723
7
2357235
8
23572357
9
235723572
10
2357235723
[2,23,235,2357,23572,235723,2357235,23572357, 235723572,2357235723]