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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 41 |
| 3 | 281 |
| 4 | 2157 |
| 5 | 17468 |
| 6 | 145485 |
| 7 | 1188839 |
| 8 | 9934415 |
| 9 | 83159859 |
| 10 | 698377561 |
| 11 | 5887978374 |
| 12 | 49721599049 |
| 13 | 420447933252 |
| 14 | 3558743911515 |
| 15 | 30138816610398 |
| 16 | 255354080222866 |
| 17 | 2164080579680386 |
| 18 | 18343719103540772 |
| 19 | 155508281837894034 |
[8,41,281,2157,17468,145485,1188839,9934415, 83159859,698377561,5887978374,49721599049, 420447933252,3558743911515,30138816610398, 255354080222866,2164080579680386, 18343719103540772,155508281837894034] |