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A079929
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a(n)=(3*n+1)!/(n!*3^n).
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0
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1, 8, 280, 22400, 3203200, 717516800, 231757926400, 101973487616000, 58634755379200000, 42686101916057600000, 38374805622535782400000, 41751788517318931251200000, 54068566129928015970304000000
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