| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 160 |
| 3 | 13683 |
| 4 | 1334973 |
| 5 | 137489538 |
| 6 | 14587480744 |
| 7 | 1597855917875 |
| 8 | 182011677068828 |
| 9 | 21714188491890254 |
| 10 | 2721720866571310952 |
| 11 | 357937736330145145387 |
[4,160,13683,1334973,137489538,14587480744, 1597855917875,182011677068828,21714188491890254, 2721720866571310952,357937736330145145387] |