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A143795
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Start with 1; then repeatedly add 1, then add 10.
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0
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| 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, Nov 25 2010]
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CROSSREFS
| Sequence in context: A037311 A031257 A178362 * A032931 A072483 A081539
Adjacent sequences: A143792 A143793 A143794 * A143796 A143797 A143798
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KEYWORD
| nonn,easy
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AUTHOR
| Luis Farfan (ljfarfan(AT)gmail.com), Sep 01 2008
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EXTENSIONS
| Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 04 2008
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