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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 74 |
| 3 | 76 |
| 4 | 740 |
| 5 | 760 |
| 6 | 7400 |
| 7 | 7600 |
| 8 | 74000 |
| 9 | 74476 |
| 10 | 76000 |
| 11 | 77766 |
| 12 | 667574 |
| 13 | 740000 |
| 14 | 744760 |
| 15 | 757666 |
| 16 | 760000 |
| 17 | 777660 |
| 18 | 777666 |
| 19 | 6675740 |
| 20 | 7075076 |
| 21 | 7400000 |
| 22 | 7447600 |
| 23 | 7576660 |
| 24 | 7600000 |
| 25 | 7776600 |
| 26 | 7776660 |
| 27 | 66757400 |
| 28 | 67577766 |
| 29 | 67607474 |
| 30 | 70750760 |
| 31 | 74000000 |
| 32 | 74474476 |
| 33 | 74476000 |
| 34 | 74476574 |
| 35 | 75765474 |
| 36 | 75766600 |
| 37 | 76000000 |
| 38 | 77750074 |
| 39 | 77766000 |
| 40 | 77766600 |
| 41 | 667574000 |
[0,74,76,740,760,7400,7600,74000,74476,76000, 77766,667574,740000,744760,757666,760000,777660, 777666,6675740,7075076,7400000,7447600,7576660, 7600000,7776600,7776660,66757400,67577766, 67607474,70750760,74000000,74474476,74476000, 74476574,75765474,75766600,76000000,77750074, 77766000,77766600,667574000] |