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| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 149 |
| 3 | 1039 |
| 4 | 7139 |
| 5 | 48949 |
| 6 | 335519 |
| 7 | 2299699 |
| 8 | 15762389 |
| 9 | 108037039 |
| 10 | 740496899 |
| 11 | 5075441269 |
| 12 | 34787591999 |
| 13 | 238437702739 |
| 14 | 1634276327189 |
| 15 | 11201496587599 |
| 16 | 76776199786019 |
| 17 | 526231901914549 |
| 18 | 3606847113615839 |
| 19 | 24721697893396339 |
| 20 | 169445038140158549 |
| 21 | 1161393569087713519 |
[19,149,1039,7139,48949,335519,2299699,15762389, 108037039,740496899,5075441269,34787591999, 238437702739,1634276327189,11201496587599, 76776199786019,526231901914549,3606847113615839, 24721697893396339,169445038140158549, 1161393569087713519] |