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A003001
as a simple table
n
a(n)
0
0
1
10
2
25
3
39
4
77
5
679
6
6788
7
68889
8
2677889
9
26888999
10
3778888999
11
277777788888899
[0,10,25,39,77,679,6788,68889,2677889,26888999, 3778888999,277777788888899]