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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 75 |
| 4 | 3456 |
| 5 | 300125 |
| 6 | 42467328 |
| 7 | 8931928887 |
| 8 | 2621440000000 |
| 9 | 1025271882697689 |
| 10 | 515978035200000000 |
| 11 | 325063112540091870659 |
| 12 | 250738401558910243700736 |
| 13 | 232526248038920243408203125 |
| 14 | 255326682647558617373989666816 |
| 15 | 327696095670976278474202880859375 |
| 16 | 486146690661928563361690196851556352 |
[1,4,75,3456,300125,42467328,8931928887, 2621440000000,1025271882697689,515978035200000000, 325063112540091870659,250738401558910243700736, 232526248038920243408203125, 255326682647558617373989666816, 327696095670976278474202880859375, 486146690661928563361690196851556352] |