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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 49 |
| 3 | 215 |
| 4 | 651 |
| 5 | 6651 |
| 6 | 66367 |
| 7 | 206020 |
| 8 | 635959 |
| 9 | 6651759 |
| 10 | 21411348 |
| 11 | 66651759 |
| 12 | 666816649 |
| 13 | 666651759 |
| 14 | 6666651759 |
| 15 | 64687340681 |
| 16 | 210818509825 |
| 17 | 1115546688777 |
| 18 | 6666665142651 |
[6,49,215,651,6651,66367,206020,635959,6651759, 21411348,66651759,666816649,666651759,6666651759, 64687340681,210818509825,1115546688777, 6666665142651] |