

A120796


Denominators of partial sums of Catalan numbers scaled by powers of 1/20.


4



1, 20, 200, 1600, 80000, 1600000, 16000000, 1280000000, 512000000, 256000000000, 2560000000000, 102400000000000, 1024000000000000, 4096000000000000, 40960000000000000, 6553600000000000000
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OFFSET

0,2


COMMENTS

Numerators are given under A120791.


LINKS



FORMULA

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.


CROSSREFS



KEYWORD

nonn,easy,frac


AUTHOR



STATUS

approved



