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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 81 |
| 3 | 2025 |
| 4 | 20736 |
| 5 | 262144 |
| 6 | 3748096 |
| 7 | 54479161 |
| 8 | 741200625 |
| 9 | 10251562500 |
| 10 | 143054150625 |
| 11 | 1998607065841 |
| 12 | 27789935251456 |
| 13 | 386869246296064 |
| 14 | 5389119716069376 |
| 15 | 75077285065499025 |
| 16 | 1045564592618903841 |
[4,81,2025,20736,262144,3748096,54479161, 741200625,10251562500,143054150625,1998607065841, 27789935251456,386869246296064,5389119716069376, 75077285065499025,1045564592618903841] |