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Search: id:A136013
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| A136013 |
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a(n) = floor(n/2) + 2 a(floor(n/2), a(0) = 0. |
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+0
1
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| 0, 0, 1, 1, 4, 4, 5, 5, 12, 12, 13, 13, 16, 16, 17, 17, 32, 32, 33, 33, 36, 36, 37, 37, 44, 44, 45, 45, 48, 48, 49, 49, 80, 80, 81, 81, 84, 84, 85, 85, 92, 92, 93, 93, 96, 96, 97, 97, 112, 112, 113, 113, 116, 116, 117, 117, 124, 124, 125, 125, 128
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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A recusive sequence that seems to be related to the ruler function.
It seems that a(2n)=a(2n+1)=A080277(n). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 31 2008
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MAPLE
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a:=proc(n) if n=0 then 0 else floor((1/2)*n)+2*a(floor((1/2)*n)) end if end proc: seq(a(n), n=0..60); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 31 2008
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MATHEMATICA
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a = {0}; Do[AppendTo[a, Floor[n/2] + 2*a[[Floor[n/2] + 1]]], {n, 1, 100}]; a - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 24 2008
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CROSSREFS
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Cf. A080277.
Sequence in context: A120205 A152465 A082968 this_sequence A114884 A132704 A120197
Adjacent sequences: A136010 A136011 A136012 this_sequence A136014 A136015 A136016
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KEYWORD
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nonn,easy
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AUTHOR
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Jack Preston (jpreston(AT)earthlink.net), Mar 20 2008
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com) and Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 24 2008
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