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A007615 as a simple table

n a(n)
1 3
2 11
3 37
4 101
5 333667
6 9091
7 9901
8 909091
9 1111111111111111111
10 11111111111111111111111
11 99990001
12 999999000001
13 909090909090909091
14 900900900900990990990991
15 9999999900000001
16 909090909090909090909090909091
17 900900900900900900900900900900990990990990990990990990990991

[3,11,37,101,333667,9091,9901,909091,
 1111111111111111111,11111111111111111111111,
 99990001,999999000001,909090909090909091,
 900900900900990990990991,9999999900000001,
 909090909090909090909090909091,
 90090090090090090090090090090099099099099099099099\
 0990990991]

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Last modified June 4 03:40 EDT 2020. Contains 334815 sequences. (Running on oeis4.)