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A014909
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a(1)=1, a(n) = 23*a(n-1) + n.
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2
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1, 25, 578, 13298, 305859, 7034763, 161799556, 3721389796, 85591965317, 1968615202301, 45278149652934, 1041397442017494, 23952141166402375, 550899246827254639, 12670682677026856712, 291425701571617704392
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OFFSET
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1,2
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LINKS
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FORMULA
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a(1)=1, a(2)=25, a(3)=578, a(n) = 25*a(n-1) - 47*a(n-2) + 23*a(n-3). - Harvey P. Dale, Feb 05 2012
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MATHEMATICA
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Transpose[NestList[{First[#]+1, 23Last[#]+First[#]+1}&, {1, 1}, 20]][[2]] (* or *) LinearRecurrence[{25, -47, 23}, {1, 25, 578}, 20] (* Harvey P. Dale, Feb 05 2012 *)
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PROG
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(Magma) I:=[1, 25, 578]; [n le 3 select I[n] else 25*Self(n-1)-47*Self(n-2)+23*Self(n-3): n in [1..30]]; // Vincenzo Librandi, Feb 05 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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