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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 271 |
| 3 | 18744 |
| 4 | 1409129 |
| 5 | 107709266 |
| 6 | 8259321811 |
| 7 | 633724470764 |
| 8 | 48630297616989 |
| 9 | 3731839458899046 |
| 10 | 286378755661153351 |
| 11 | 21976523359713989184 |
| 12 | 1686464664689831932049 |
| 13 | 129418247854721047490426 |
[6,271,18744,1409129,107709266,8259321811, 633724470764,48630297616989,3731839458899046, 286378755661153351,21976523359713989184, 1686464664689831932049,129418247854721047490426] |