A068692 - OEIS

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A068692 as a simple table

n	a(n)
1	7
2	89
3	887
4	8887
5	88883
6	888887
7	8888861
8	88888883
9	888888887
10	8888888809
11	88888888801
12	888888888887
13	8888888888849
14	88888888888889
15	888888888888883
16	8888888888888647
17	88888888888888889
18	888888888888888809

[7,89,887,8887,88883,888887,8888861,88888883, 888888887,8888888809,88888888801,888888888887, 8888888888849,88888888888889,888888888888883, 8888888888888647,88888888888888889, 888888888888888809]