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A174603
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a(n) = n!*3^n/Gamma((n+1)/3) *sum_{k=0..floor(n/3)} 3^(-k) *Gamma((n+1)/3-k) / (k!*(n-3*k)!) , where Gamma (Greek capital gamma) is the Gamma-function.
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0
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1, 3, 9, 189, 1053, 5103, 88209, 645165, 4048137, 65209779, 563386509, 4202694477, 65731280085, 638202713931, 5411035008297, 83729760898797, 888040122326001, 8324727674858595
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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