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Search: id:A128531
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| A128531 |
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a(n) = numerator of r(n): r(n) is such that the continued fraction (of rational terms) [r(1);r(2),...r(n)] equals the n-th Fibonacci number, for every positive integer n. |
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+0
2
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| 1, 1, -2, 3, -10, 6, -65, 378, -5525, 16632, -1278485, 25147584, -1012815817, 8022079296, -2114837334805, 570081043090944, -60533314393713485, 1256458618972440576, -4540728540084435567025, 1677888660820605842036736, -466914087740138106185288665
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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FORMULA
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For n>=4, r(n) = -F(n)/(F(n-3) r(n-1)), where F(n) is the n-th Fibonacci number.
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EXAMPLE
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The 5th Fibonacci number = 5 = 1 +1/(1 +1/(-2 +1/(3/2 -3/10))).
The 6th Fibonacci number = 8 = 1 +1/(1 +1/(-2 +1/(3/2 +1/(-10/3 +5/6)))).
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MAPLE
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L2cfrac := proc(L, targ) local a, i; a := targ ; for i from 1 to nops(L) do a := 1/(a-op(i, L)) ; od: end: A128531 := proc(nmax) local b, n, bnxt; b := [1] ; for n from nops(b)+1 to nmax do bnxt := L2cfrac(b, combinat[fibonacci](n+1)) ; b := [op(b), bnxt] ; od: [seq( numer(b[i]), i=1..nops(b))] ; end: A128531(22) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 09 2007
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CROSSREFS
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Cf. A128532.
Sequence in context: A064946 A078730 A163767 this_sequence A123167 A141670 A074068
Adjacent sequences: A128528 A128529 A128530 this_sequence A128532 A128533 A128534
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KEYWORD
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frac,sign
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AUTHOR
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Leroy Quet Mar 08 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 09 2007
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