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| n | a(n) |
|---|---|
| 2 | 7 |
| 3 | 18 |
| 4 | 73 |
| 5 | 424 |
| 6 | 2741 |
| 7 | 18389 |
| 8 | 124799 |
| 9 | 851937 |
| 10 | 5831634 |
| 11 | 39952039 |
| 12 | 273777171 |
| 13 | 1876334786 |
| 14 | 12860231668 |
[7,18,73,424,2741,18389,124799,851937,5831634, 39952039,273777171,1876334786,12860231668] |