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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 44 |
| 3 | 436 |
| 4 | 4518 |
| 5 | 47156 |
| 6 | 492102 |
| 7 | 5133044 |
| 8 | 53529806 |
| 9 | 558164472 |
| 10 | 5819704716 |
| 11 | 60677191216 |
| 12 | 632619159318 |
| 13 | 6595610902832 |
| 14 | 68764677891112 |
| 15 | 716926331557236 |
| 16 | 7474513869766556 |
| 17 | 77927543824707370 |
| 18 | 812454058048811426 |
[4,44,436,4518,47156,492102,5133044,53529806, 558164472,5819704716,60677191216,632619159318, 6595610902832,68764677891112,716926331557236, 7474513869766556,77927543824707370, 812454058048811426] |