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Search: id:A131444
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| A131444 |
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Denominators of n-th approximation of factorial (also called harmonic) expansion of the golden section phi:=(1+sqrt(5))/2. |
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+0
2
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| 1, 2, 2, 12, 60, 60, 280, 40320, 22680, 3628800, 1900800, 479001600, 6227020800, 6227020800, 1307674368000, 1307674368000, 13680285696000, 582033973248000, 24329020081766400, 2432902008176640000
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numerators are given in A131443.
For the rationals r(n) see the W. Lang link found under A131443.
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FORMULA
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a(n)=denominator(r(n)), with r(n):=sum(b(k)/k!,n=1..n) with b(k):=A068451(k).
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EXAMPLE
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Rationals r(n):[1, 3/2, 3/2, 19/12, 97/60, 97/60, 453/280, 65239/40320,...].
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CROSSREFS
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Sequence in context: A151366 A033886 A087131 this_sequence A013315 A032321 A013311
Adjacent sequences: A131441 A131442 A131443 this_sequence A131445 A131446 A131447
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KEYWORD
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nonn,frac,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Aug 07 2007
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