A083461 - OEIS

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A083461 as a simple table

n	a(n)
1	0
2	3
3	7
4	9999
5	242
6	999999
7	9999999
8	99999999
9	999999999
10	9999999999
11	99999999999
12	999999999999
13	9999999999999
14	99999999999999
15	999999999999999
16	9999999999999999
17	99999999999999999
18	999999999999999999

[0,3,7,9999,242,999999,9999999,99999999,999999999, 9999999999,99999999999,999999999999,9999999999999, 99999999999999,999999999999999,9999999999999999, 99999999999999999,999999999999999999]