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| n | a(n) |
|---|---|
| 0 | 7 |
| 1 | 39 |
| 2 | 199 |
| 3 | 999 |
| 4 | 4999 |
| 5 | 24999 |
| 6 | 124999 |
| 7 | 624999 |
| 8 | 3124999 |
| 9 | 15624999 |
| 10 | 78124999 |
| 11 | 390624999 |
| 12 | 1953124999 |
| 13 | 9765624999 |
| 14 | 48828124999 |
| 15 | 244140624999 |
| 16 | 1220703124999 |
| 17 | 6103515624999 |
| 18 | 30517578124999 |
| 19 | 152587890624999 |
| 20 | 762939453124999 |
[7,39,199,999,4999,24999,124999,624999,3124999, 15624999,78124999,390624999,1953124999,9765624999, 48828124999,244140624999,1220703124999, 6103515624999,30517578124999,152587890624999, 762939453124999] |