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A245584
as a simple table
n
a(n)
1
1
2
2
3
3
4
12
5
122
6
1222
7
12222
8
122222
9
1222222
10
12222222
11
122222222
[1,2,3,12,122,1222,12222,122222,1222222,12222222, 122222222]