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Search: id:A134990
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| A134990 |
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Interleave two arithmetic progressions 8,10,12,14,... and 15,13,11,9,... of differences +2 and -2 respectively. |
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+0
1
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| 8, 15, 10, 13, 12, 11, 14, 9, 16, 7, 18, 5, 20, 3, 22, 1, 24, -1, 26, -3, 28, -5, 30, -7, 32, -9, 34, -11, 36, -13, 38, -15, 40, -17, 42, -19, 44, -21, 46, -23, 48, -25, 50, -27, 52, -29, 54, -31, 56, -33, 58, -35, 60, -37, 62, -39, 64, -41, 66, -43, 68, -45, 70, -47, 72, -49, 74, -51, 76, -53, 78, -55, 80, -57, 82, -59, 84, -61
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Terry H. Stickels, Mesmerizing Mind-Bending Puzzles, Sterling Publishing Company, Inc. 2002. Page 21
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FORMULA
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O.g.f.: -x(17x^2+23x+8)/[(1+x)^2*(-1+x)] . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 06 2008
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MATHEMATICA
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Table[If[OddQ[n], n + 7, 17 - n], {n, 1, 60}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 07 2008
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CROSSREFS
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Sequence in context: A082170 A136377 A103706 this_sequence A126852 A114605 A031103
Adjacent sequences: A134987 A134988 A134989 this_sequence A134991 A134992 A134993
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KEYWORD
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sign
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AUTHOR
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Kate Ross (rossk1111(AT)yahoo.com), Feb 05 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 06 2008
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