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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 59 |
| 3 | 538 |
| 4 | 5149 |
| 5 | 51059 |
| 6 | 520035 |
| 7 | 5407889 |
| 8 | 57181230 |
| 9 | 612910369 |
| 10 | 6644662132 |
| 11 | 72731584789 |
| 12 | 802696690614 |
| 13 | 8922392225233 |
| 14 | 99798739026795 |
| 15 | 1122441028044882 |
| 16 | 12686176392341722 |
| 17 | 144013323190860339 |
| 18 | 1641303449002365323 |
| 19 | 18772674107796041770 |
| 20 | 215413772477355781876 |
[1,7,59,538,5149,51059,520035,5407889,57181230, 612910369,6644662132,72731584789,802696690614, 8922392225233,99798739026795,1122441028044882, 12686176392341722,144013323190860339, 1641303449002365323,18772674107796041770, 215413772477355781876] |