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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6728 |
| 2 | 53786626921 |
| 3 | 57248060375968384 |
| 4 | 123115692449982216049513 |
| 5 | 216388579168758145017797108072 |
[1,6728,53786626921,57248060375968384, 123115692449982216049513, 216388579168758145017797108072] |