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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 39 |
| 3 | 69 |
| 4 | 324 |
| 5 | 549 |
| 6 | 774 |
| 7 | 2799 |
| 8 | 4599 |
| 9 | 6399 |
| 10 | 8199 |
| 11 | 24999 |
| 12 | 39999 |
| 13 | 54999 |
| 14 | 69999 |
| 15 | 84999 |
| 16 | 228570 |
| 17 | 357141 |
| 18 | 485712 |
| 19 | 614283 |
| 20 | 742854 |
| 21 | 871425 |
| 22 | 2124999 |
| 23 | 3249999 |
| 24 | 4374999 |
| 25 | 5499999 |
| 26 | 6624999 |
| 27 | 7749999 |
| 28 | 8874999 |
| 29 | 19999999 |
| 30 | 29999999 |
| 31 | 39999999 |
| 32 | 49999999 |
| 33 | 59999999 |
| 34 | 69999999 |
| 35 | 79999999 |
| 36 | 89999999 |
[4,39,69,324,549,774,2799,4599,6399,8199,24999, 39999,54999,69999,84999,228570,357141,485712, 614283,742854,871425,2124999,3249999,4374999, 5499999,6624999,7749999,8874999,19999999,29999999, 39999999,49999999,59999999,69999999,79999999, 89999999] |