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A065530
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If n is odd then a(n) = n, else a(n) = n*(n+2).
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3
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0, 1, 8, 3, 24, 5, 48, 7, 80, 9, 120, 11, 168, 13, 224, 15, 288, 17, 360, 19, 440, 21, 528, 23, 624, 25, 728, 27, 840, 29, 960, 31, 1088, 33, 1224, 35, 1368, 37, 1520, 39, 1680, 41, 1848, 43, 2024, 45, 2208, 47, 2400, 49, 2600, 51, 2808, 53, 3024, 55, 3248, 57
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Order of Fibonacci group F(n+1,2) (0 means group is infinite). - N. J. A. Sloane, Dec 30 2011
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REFERENCES
| D. L. Johnson, Presentation of Groups, Cambridge, 1976, p. 182.
Thomas, Richard M., The Fibonacci groups revisited, in Groups - St. Andrews 1989, Vol. 2, 445-454, London Math. Soc. Lecture Note Ser., 160, Cambridge Univ. Press, Cambridge, 1991.
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,1000
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FORMULA
| O.g.f.: (x+8x^2-x^5)/(1-x^2)^3. - Len Smiley (smiley(AT)math.uaa.alaska.edu), Dec 04 2001
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PROG
| (PARI) { for (n=0, 1000, if (n%2, a=n, a=n*(n + 2)); write("b065530.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 20 2009]
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CROSSREFS
| A column of A202624.
Sequence in context: A195161 A144433 A037206 * A137481 A004734 A049074
Adjacent sequences: A065527 A065528 A065529 * A065531 A065532 A065533
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KEYWORD
| easy,nonn
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AUTHOR
| George E. Antoniou (george.antoniou(AT)montclair.edu), Dec 02 2001
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Dec 04 2001
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