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A036293
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a(n) = n * 7^n.
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5
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0, 7, 98, 1029, 9604, 84035, 705894, 5764801, 46118408, 363182463, 2824752490, 21750594173, 166095446412, 1259557135291, 9495123019886, 71213422649145, 531726889113616, 3954718737782519, 29311444762388082, 216579008522089717
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OFFSET
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0,2
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LINKS
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FORMULA
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a(0)=0, a(1)=7, a(n) = 14*a(n-1) - 49*a(n-2). - Harvey P. Dale, Aug 08 2011
Sum_{n>=1} 1/a(n) = log(7/6).
Sum_{n>=1} (-1)^(n+1)/a(n) = log(8/7). (End)
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MATHEMATICA
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Table[n 7^n, {n, 0, 30}] (* or *) LinearRecurrence[{14, -49}, {0, 7}, 31] (* Harvey P. Dale, Aug 08 2011 *)
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PROG
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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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