OFFSET
1,2
EXAMPLE
n=5: 2*2/(2+2)+2*3/(2+3)+3*3/(3+3)+2*5/(2+5)+2*7/(2+7) =
4/4 + 6/5 + 9/6 + 10/7 + 14/9 = 4211/630 = a(5)/A120834(5).
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Reinhard Zumkeller, Jul 24 2006
STATUS
approved