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Search: id:A143795
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| A143795 |
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Start with 1; then repeatedly add 1, then add 10. |
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+0
1
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| 1, 2, 12, 13, 23, 24, 34, 35, 45, 46, 56, 57, 67, 68, 78, 79, 89, 90, 100, 101, 111, 112, 122, 123, 133, 134, 144, 145, 155, 156, 166, 167, 177, 178, 188, 189, 199, 200, 210, 211, 221, 222, 232, 233, 243, 244, 254, 255, 265, 266, 276, 277, 287, 288, 298, 299
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)= (22*n-27-9*(-1)^n)/4. G.f.: x(1+x+9x^2)/((1+x)(1-x)^2). a(n)=a(n-2)+11. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008]
a(n)=11*n-a(n-1)-19 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009]
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EXAMPLE
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For n=2, a(2)=11*2-1-19=2; n=3, a(3)=11*3-2-19=12; n=4, a(4)=11*4-12-19=13 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 27 2009]
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CROSSREFS
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Sequence in context: A028424 A037311 A031257 this_sequence A032931 A072483 A081539
Adjacent sequences: A143792 A143793 A143794 this_sequence A143796 A143797 A143798
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KEYWORD
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nonn,easy,new
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AUTHOR
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Luis Farfan (ljfarfan(AT)gmail.com), Sep 01 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008
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