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A168460
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a(n)=10*n-a(n-1)-8, with a(1)=6.
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0
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6, 6, 16, 16, 26, 26, 36, 36, 46, 46, 56, 56, 66, 66, 76, 76, 86, 86, 96, 96, 106, 106, 116, 116, 126, 126, 136, 136, 146, 146, 156, 156, 166, 166, 176, 176, 186, 186, 196, 196, 206, 206, 216, 216, 226, 226, 236, 236, 246, 246, 256, 256, 266, 266, 276, 276, 286
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..57.
Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
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FORMULA
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a(n) = 2*A168283(n). a(n+1) = A017341(floor(n/2)). G.f. 2*x*(3+2*x^2) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Jan 04 2011
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EXAMPLE
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For n=2, a(2)=10*2-6-8=6; n=3, a(3)=10*3-6-8=16; n=4, a(4)=10*4-16-8=16
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MATHEMATICA
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RecurrenceTable[{a[1]==6, a[n]==10n-a[n-1]-8}, a, {n, 80}] (* or *) LinearRecurrence[{1, 1, -1}, {6, 6, 16}, 80] (* From Harvey P. Dale, Apr 25 2011 *)
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CROSSREFS
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Sequence in context: A168414 A058563 A175561 * A038518 A151724 A000976
Adjacent sequences: A168457 A168458 A168459 * A168461 A168462 A168463
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Nov 26 2009
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STATUS
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approved
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