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A289910 The denominator of r(n), where r(n) = 1/r(n-2) + r(n-1); r(1)=r(2)=1/2. 1
2, 2, 2, 2, 10, 90, 4410, 2033010, 47753371890, 536047310324601810, 146146505822254040921594435610, 461461505298297622704608601547181743257756610890, 409066116871912908631970281597531260628466742447938742767153852110729821286410 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
It appears that the sequence is always in simplest terms when generated.
LINKS
MATHEMATICA
r[n_] := r[n] = If[n <= 2, 1/2, 1/r[n - 2] + r[n - 1]]; Denominator@ Array[r, 13] (* Michael De Vlieger, Jul 15 2017 *)
CROSSREFS
Cf. A289909 (numerators).
Sequence in context: A217503 A165466 A175392 * A112727 A164918 A147822
KEYWORD
nonn,frac
AUTHOR
John Harmon, Jul 15 2017
STATUS
approved

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Last modified April 12 07:56 EDT 2024. Contains 371626 sequences. (Running on oeis4.)