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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 1764 |
| 4 | 68644 |
| 5 | 3341584 |
| 6 | 190992400 |
| 7 | 12310790116 |
| 8 | 871343837764 |
| 9 | 66469126179600 |
| 10 | 5391179227622500 |
| 11 | 460213149486493456 |
| 12 | 41024422751464102500 |
| 13 | 3795407861954983718544 |
| 14 | 362631040029370613957184 |
| 15 | 35638591665642822414493156 |
| 16 | 3590789985613539065908070116 |
| 17 | 369893506453438150061450367376 |
[4,64,1764,68644,3341584,190992400,12310790116, 871343837764,66469126179600,5391179227622500, 460213149486493456,41024422751464102500, 3795407861954983718544,362631040029370613957184, 35638591665642822414493156, 3590789985613539065908070116, 369893506453438150061450367376] |