| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 27 |
| 3 | 461 |
| 4 | 7980 |
| 5 | 138562 |
| 6 | 2406061 |
| 7 | 41780245 |
| 8 | 725496762 |
| 9 | 12597953186 |
| 10 | 218758280685 |
| 11 | 3798647658637 |
| 12 | 65961955769536 |
| 13 | 1145402258889550 |
| 14 | 19889439592325187 |
| 15 | 345371946166981361 |
| 16 | 5997241935624779340 |
[2,27,461,7980,138562,2406061,41780245,725496762, 12597953186,218758280685,3798647658637, 65961955769536,1145402258889550,19889439592325187, 345371946166981361,5997241935624779340] |