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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 38 |
| 3 | 682 |
| 4 | 12238 |
| 5 | 219602 |
| 6 | 3940598 |
| 7 | 70711162 |
| 8 | 1268860318 |
| 9 | 22768774562 |
| 10 | 408569081798 |
| 11 | 7331474697802 |
| 12 | 131557975478638 |
| 13 | 2360712083917682 |
| 14 | 42361259535039638 |
| 15 | 760141959546795802 |
| 16 | 13640194012307284798 |
| 17 | 244763350261984330562 |
| 18 | 4392100110703410665318 |
| 19 | 78813038642399407645162 |
[2,38,682,12238,219602,3940598,70711162, 1268860318,22768774562,408569081798,7331474697802, 131557975478638,2360712083917682, 42361259535039638,760141959546795802, 13640194012307284798,244763350261984330562, 4392100110703410665318,78813038642399407645162] |