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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 69 |
| 3 | 489 |
| 4 | 3773 |
| 5 | 29359 |
| 6 | 229371 |
| 7 | 1793675 |
| 8 | 14030597 |
| 9 | 109759917 |
| 10 | 858660839 |
| 11 | 6717419531 |
| 12 | 52551380915 |
| 13 | 411117567181 |
| 14 | 3216236722495 |
| 15 | 25161121675789 |
| 16 | 196839383096437 |
| 17 | 1539905230937741 |
| 18 | 12046919094905577 |
| 19 | 94244929368967819 |
[1,9,69,489,3773,29359,229371,1793675,14030597, 109759917,858660839,6717419531,52551380915, 411117567181,3216236722495,25161121675789, 196839383096437,1539905230937741, 12046919094905577,94244929368967819] |