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A122874
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List of pairs n+7, 13-n, n >= 0.
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0
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7, 13, 8, 12, 9, 11, 10, 10, 11, 9, 12, 8, 13, 7, 14, 6, 15, 5, 16, 4, 17, 3, 18, 2, 19, 1, 20, 0, 21, -1, 22, -2, 23, -3, 24, -4, 25, -5, 26, -6, 27, -7, 28, -8, 29, -9, 30, -10, 31, -11, 32, -12, 33, -13, 34, -14, 35, -15, 36, -16, 37, -17, 38, -18, 39, -19, 40, -20, 41, -21, 42
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| a(n)= -a(n-1)+a(n-2)+a(n-3). G.f.: -(7+20*x+14*x^2)/((x-1)*(1+x)^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2009]
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CROSSREFS
| Sequence in context: A046163 A130770 A158622 * A066003 A115858 A114389
Adjacent sequences: A122871 A122872 A122873 * A122875 A122876 A122877
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KEYWORD
| easy,sign,tabf
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AUTHOR
| Stuart M. Ellerstein (ellerstein(AT)aol.com), Oct 23 2006
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EXTENSIONS
| Edited with better definition by Omar E. Pol (info(AT)polprimos.com) and N. J. A. Sloane (njas(AT)research.att.com), Jan 02 2009
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2009
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