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Search: id:A103889
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| A103889 |
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Odd and even positive integers swapped. |
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+0
7
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| 2, 1, 4, 3, 6, 5, 8, 7, 10, 9, 12, 11, 14, 13, 16, 15, 18, 17, 20, 19, 22, 21, 24, 23, 26, 25, 28, 27, 30, 29, 32, 31, 34, 33, 36, 35, 38, 37, 40, 39, 42, 41, 44, 43, 46, 45, 48, 47, 50, 49, 52, 51, 54, 53, 56, 55, 58, 57, 60, 59, 62, 61, 64, 63, 66, 65, 68, 67, 70, 69, 72, 71
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(2k)=2k-1=A005408(k), a(2k-1)=2k=A005843(k), k=1, 2, ...
O.g.f.: x*(x^2-x+2)/[(x-1)^2*(1+x)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 06 2008
a(n) = n-1+2*(n mod 2) - Rolf Pleisch (r_pleisch(AT)gmx.ch), Apr 22 2008
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MATHEMATICA
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Table[{n + 1, n}, {n, 1, 100, 2}] // Flatten
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CROSSREFS
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Essentially the same as A014681. Odd numbers: A005408. Even numbers: A005843.
Cf. A103889.
Adjacent sequences: A103886 A103887 A103888 this_sequence A103890 A103891 A103892
Sequence in context: A076981 A114285 A014681 this_sequence A137805 A096779 A026262
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 20 2005
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