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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 7 |
| 4 | 20 |
| 5 | 27 |
| 6 | 47 |
| 7 | 70 |
| 8 | 97 |
| 9 | 200 |
| 10 | 270 |
| 11 | 470 |
| 12 | 497 |
| 13 | 700 |
| 14 | 970 |
| 15 | 997 |
| 16 | 2000 |
| 17 | 2700 |
| 18 | 4700 |
| 19 | 4970 |
| 20 | 4997 |
| 21 | 7000 |
| 22 | 9700 |
| 23 | 9970 |
| 24 | 9997 |
| 25 | 20000 |
| 26 | 22247 |
| 27 | 27000 |
| 28 | 44747 |
| 29 | 44777 |
| 30 | 47000 |
| 31 | 49700 |
| 32 | 49777 |
| 33 | 49970 |
| 34 | 49997 |
| 35 | 70000 |
| 36 | 97000 |
| 37 | 99700 |
| 38 | 99970 |
| 39 | 99997 |
| 40 | 200000 |
| 41 | 222470 |
| 42 | 270000 |
| 43 | 447470 |
| 44 | 447770 |
| 45 | 470000 |
| 46 | 497000 |
| 47 | 497770 |
| 48 | 499297 |
| 49 | 499700 |
| 50 | 499777 |
| 51 | 499970 |
| 52 | 499997 |
| 53 | 700000 |
| 54 | 704997 |
| 55 | 970000 |
[0,2,7,20,27,47,70,97,200,270,470,497,700,970,997, 2000,2700,4700,4970,4997,7000,9700,9970,9997, 20000,22247,27000,44747,44777,47000,49700,49777, 49970,49997,70000,97000,99700,99970,99997,200000, 222470,270000,447470,447770,470000,497000,497770, 499297,499700,499777,499970,499997,700000,704997, 970000] |