OFFSET
2,1
EXAMPLE
2, 6, 11, 20, 101/3, 175/3, 593/6, 173, 1502/5, 2684/5, 28649/30, ...
MAPLE
b := binomial; f3 := n->if n mod 2 = 0 then 2*add(b(n, w)/w, w=1..n/2-1)+b(n, n/2)/(n/2); else 2*add(b(n, w)/w, w=1..(n-1)/2); fi;
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Jul 07 2003
STATUS
approved