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A186086 as a simple table

na(n)
16661
216661
366601
476667
5700666007
66660000000001
7666000000000001
8700000666000007
970000006660000007
106660000000000000000000000007
1166600000000000000000000000007
121000000000000066600000000000001

[6661,16661,66601,76667,700666007,6660000000001,
 666000000000001,700000666000007,70000006660000007,
 6660000000000000000000000007,
 66600000000000000000000000007,
 1000000000000066600000000000001]