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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 16 |
| 2 | 6480 |
| 3 | 97287175440 |
| 4 | 1106928595945936328906250000 |
| 5 | 856337316801926460412829104011102303451051923953906250000 |
[2,16,6480,97287175440, 1106928595945936328906250000, 85633731680192646041282910401110230345105192395390\ 6250000] |