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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 71 |
| 3 | 452 |
| 4 | 3780 |
| 5 | 34159 |
| 6 | 290114 |
| 7 | 2561262 |
| 8 | 22815719 |
| 9 | 202611948 |
| 10 | 1807370198 |
| 11 | 16146421069 |
| 12 | 144281073566 |
| 13 | 1289983649102 |
| 14 | 11536495661767 |
| 15 | 103185404346652 |
| 16 | 922989840294958 |
| 17 | 8256506215457397 |
| 18 | 73860026738425420 |
| 19 | 660736505309331646 |
[6,71,452,3780,34159,290114,2561262,22815719, 202611948,1807370198,16146421069,144281073566, 1289983649102,11536495661767,103185404346652, 922989840294958,8256506215457397, 73860026738425420,660736505309331646] |