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Search: id:A120087
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| A120087 |
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Denominators of expansion of Debye function for n=4: D(4,x). |
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+0
2
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| 1, 5, 18, 1, 1440, 1, 75600, 1, 3628800, 1, 167650560, 1, 5230697472000, 1, 336259123200, 1, 53353114214400000, 1, 28100018194440192000, 1, 4817145976189747200000, 1, 91657150256046735360000, 1
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=denominator(r(n)), with r(n):=[x^n](1 - 2*x/5 + 2*sum((B(2*k)/((k+2)*(2*k)!))*x^(2*k),0,..infinity)), |x|<2*pi. B(2*k):=A000367(k)/A002445(k) (Bernoulli numbers).
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EXAMPLE
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Rationals r(n): [1, -2/5, 1/18, 0, -1/1440, 0, 1/75600, 0,
-1/3628800, 0, 1/167650560, 0, -691/5230697472000,...].
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CROSSREFS
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Sequence in context: A062223 A116911 A097491 this_sequence A022142 A078648 A035338
Adjacent sequences: A120084 A120085 A120086 this_sequence A120088 A120089 A120090
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KEYWORD
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nonn,easy,frac
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Jul 20 2006
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