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Search: id:A120796
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| A120796 |
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Denominators of partial sums of Catalan numbers scaled by powers of -1/20. |
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+0
5
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| 1, 20, 200, 1600, 80000, 1600000, 16000000, 1280000000, 512000000, 256000000000, 2560000000000, 102400000000000, 1024000000000000, 4096000000000000, 40960000000000000, 6553600000000000000
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OFFSET
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0,2
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COMMENT
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Numerators are given under A120791.
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FORMULA
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a(n)=denominator(r(n)), with the rationals r(n):=sum(((-1)^k)*C(k)/20^k,k=0..n) with C(k):=A000108(k) (Catalan numbers). Rationals r(n) are taken in lowest terms.
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CROSSREFS
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Sequence in context: A045758 A035474 A103261 this_sequence A120787 A099197 A041766
Adjacent sequences: A120793 A120794 A120795 this_sequence A120797 A120798 A120799
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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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