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| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 1877922 |
| 3 | 194706720450 |
| 4 | 20187582187830642 |
| 5 | 2093088896203949915058 |
| 6 | 217015642916030352905224578 |
| 7 | 22500615886726770153715544792802 |
| 8 | 2332908856150589340161504762302084050 |
| 9 | 241880656000904788079898366611289133690962 |
[18,1877922,194706720450,20187582187830642, 2093088896203949915058, 217015642916030352905224578, 22500615886726770153715544792802, 2332908856150589340161504762302084050, 241880656000904788079898366611289133690962] |