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A016065
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a(n) = Sum_{k=0..n} k!*(k+1)!.
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1
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1, 3, 15, 159, 3039, 89439, 3718239, 206931039, 14838252639, 1331657196639, 146181741036639, 19266392807916639, 3002019319241196639, 545863051930098156639, 114546679900210059756639, 27474742723487400843756639, 7469448066579203294091756639, 2284713285166428266627979756639
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OFFSET
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0,2
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COMMENTS
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LINKS
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MATHEMATICA
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PROG
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(PARI) a(n) = sum(k=0, n, k!*(k+1)!); \\ Michel Marcus, Jan 02 2019
(Magma) [&+[ Factorial(k)*Factorial(k+1): k in [0..n]]: n in [0..18]]; // Vincenzo Librandi, Jan 02 2019
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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