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Search: id:A065598
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| A065598 |
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a(0)=0, a(1)=1, a(2)=2; for n>=3, a(n) = 2*a(n-1)*a(n-2)-a(n-3). |
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2
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| 0, 1, 2, 4, 15, 118, 3536, 834481, 5901449514, 9849294983780932, 116250234190553238066899615, 2289965696952749203147232235388377288832846, 532418097118181120851300401934424857560888078403591714456723409727648
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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F. Axel et al., Vibrational modes in a one dimensional "quasi-alloy": the Morse case, J. de Physique, Colloq. C3, Supp. to No. 7, Vol. 47 (Jul 1986), pp. C3-181-C3-186; see Eq. (10).
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,17
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MAPLE
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A065598 := proc(n) option remember; if n <= 2 then n else 2*A065598(n-1)*A065598(n-2)-A065598(n-3); fi; end;
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PROGRAM
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(PARI) { for (n = 0, 17, if (n>2, a=2*a1*a2-a3; a3=a2; a2=a1; a1=a, if (n==0, a=a3=0, if (n==1, a=a2=1, a=a1=2))); write("b065598.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 23 2009]
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CROSSREFS
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Cf. A065597.
Sequence in context: A020134 A120490 A003514 this_sequence A100528 A132483 A125594
Adjacent sequences: A065595 A065596 A065597 this_sequence A065599 A065600 A065601
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 01 2001
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