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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 9 |
| 4 | 36 |
| 5 | 84 |
| 6 | 96 |
| 7 | 99 |
| 8 | 744 |
| 9 | 936 |
| 10 | 984 |
| 11 | 996 |
| 12 | 999 |
| 13 | 5904 |
| 14 | 8976 |
| 15 | 9744 |
| 16 | 9936 |
| 17 | 9984 |
| 18 | 9996 |
| 19 | 9999 |
| 20 | 34464 |
| 21 | 83616 |
| 22 | 95904 |
| 23 | 98976 |
| 24 | 99744 |
| 25 | 99936 |
| 26 | 99984 |
| 27 | 99996 |
| 28 | 99999 |
| 29 | 737856 |
| 30 | 934464 |
| 31 | 983616 |
| 32 | 995904 |
| 33 | 998976 |
| 34 | 999744 |
| 35 | 999936 |
| 36 | 999984 |
| 37 | 999996 |
| 38 | 999999 |
| 39 | 5805696 |
| 40 | 8951424 |
[0,6,9,36,84,96,99,744,936,984,996,999,5904,8976, 9744,9936,9984,9996,9999,34464,83616,95904,98976, 99744,99936,99984,99996,99999,737856,934464, 983616,995904,998976,999744,999936,999984,999996, 999999,5805696,8951424] |