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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 40 |
| 3 | 396 |
| 4 | 3963 |
| 5 | 39636 |
| 6 | 396357 |
| 7 | 3963567 |
| 8 | 39635676 |
| 9 | 396356757 |
| 10 | 3963567567 |
| 11 | 39635675670 |
| 12 | 396356756706 |
| 13 | 3963567567057 |
| 14 | 39635675670567 |
| 15 | 396356756705673 |
| 16 | 3963567567056727 |
| 17 | 39635675670567276 |
| 18 | 396356756705672757 |
| 19 | 3963567567056727567 |
| 20 | 39635675670567275672 |
| 21 | 396356756705672756722 |
[4,40,396,3963,39636,396357,3963567,39635676, 396356757,3963567567,39635675670,396356756706, 3963567567057,39635675670567,396356756705673, 3963567567056727,39635675670567276, 396356756705672757,3963567567056727567, 39635675670567275672,396356756705672756722] |