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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 21 |
| 3 | 62 |
| 4 | 247 |
| 5 | 1202 |
| 6 | 7201 |
| 7 | 50401 |
| 8 | 403201 |
| 9 | 3628801 |
| 10 | 36288001 |
| 11 | 399168002 |
| 12 | 4790016001 |
| 13 | 62270208001 |
| 14 | 871782912007 |
| 15 | 130767436800017 |
| 16 | 209227898880001 |
| 17 | 3556874280960001 |
| 18 | 64023737057280001 |
| 19 | 12164510040883200031 |
[10,21,62,247,1202,7201,50401,403201,3628801, 36288001,399168002,4790016001,62270208001, 871782912007,130767436800017,209227898880001, 3556874280960001,64023737057280001, 12164510040883200031] |