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A065597
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a(0)=0, a(1)=1, a(2)=1; 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, 1, 2, 3, 11, 64, 1405, 179829, 505319426, 181742174114903, 183675702207469683831527, 66763242902534057178758511601478574336, 24525571043541618855545577854946122156632189794267317765667241
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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REFERENCES
| 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
| Harry J. Smith, Table of n, a(n) for n=0,...,18
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MAPLE
| A065597 := proc(n) option remember; if n <= 1 then n else 2*A065597(n-1)*A065597(n-2)-A065597(n-3); fi; end;
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PROG
| (PARI) { for (n = 0, 18, 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=1))); write("b065597.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 23 2009]
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CROSSREFS
| Cf. A065598.
Sequence in context: A110482 A105217 A066046 * A001052 A184310 A155187
Adjacent sequences: A065594 A065595 A065596 * A065598 A065599 A065600
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 01 2001
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