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 A168461 a(n) = 10*n-a(n-1)-10 (with a(1) = 0). 0
 0, 10, 10, 20, 20, 30, 30, 40, 40, 50, 50, 60, 60, 70, 70, 80, 80, 90, 90, 100, 100, 110, 110, 120, 120, 130, 130, 140, 140, 150, 150, 160, 160, 170, 170, 180, 180, 190, 190, 200, 200, 210, 210, 220, 220, 230, 230, 240, 240, 250, 250, 260, 260, 270, 270, 280 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n) = 10*floor(n/2) = A168437(n) - 3. - Rick L. Shepherd, Jun 17 2010 EXAMPLE For n=2, a(2)=10*2-0-10=10; n=3, a(3)=10*3-10-10=10; n=4, a(4)=10*4-10-10=20 CROSSREFS Bisections are A008592 and (A008592 MINUS {0}). - Rick L. Shepherd, Jun 17 2010 Sequence in context: A097041 A205724 A040091 * A022093 A076817 A200984 Adjacent sequences:  A168458 A168459 A168460 * A168462 A168463 A168464 KEYWORD nonn AUTHOR Vincenzo Librandi, Nov 26 2009 EXTENSIONS Edited by Rick L. Shepherd, Jun 17 2010 STATUS approved

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