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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 26 |
| 3 | 168 |
| 4 | 1217 |
| 5 | 9511 |
| 6 | 78029 |
| 7 | 661458 |
| 8 | 5740303 |
| 9 | 50701541 |
| 10 | 454011970 |
| 11 | 4110416300 |
| 12 | 37550193649 |
| 13 | 345618860220 |
| 14 | 3201414635780 |
| 15 | 29816233849000 |
| 16 | 279007258230819 |
| 17 | 2621647966812030 |
| 18 | 24723998785919975 |
| 19 | 233922961602470390 |
[6,26,168,1217,9511,78029,661458,5740303,50701541, 454011970,4110416300,37550193649,345618860220, 3201414635780,29816233849000,279007258230819, 2621647966812030,24723998785919975, 233922961602470390] |