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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 506 |
| 2 | 141331872 |
| 3 | 20920469730667584 |
| 4 | 1638296742744745305180456960 |
| 5 | 67868907839960050279986415163868117749760 |
| 6 | 1487321615877089920298398794877451264100990832314711736320 |
[1,506,141331872,20920469730667584, 1638296742744745305180456960, 67868907839960050279986415163868117749760, 14873216158770899202983987948774512641009908323147\ 11736320] |