OFFSET
0,2
FORMULA
a(n)=Sum{C(d, [d/2])}, d|n and C(d, [d/2])=A001405[d].
EXAMPLE
n=9, divisors={1,3,9} a(9)=C[1,0]+C[3,1]+C[9,4]=1+3+126=130
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 19 2001
STATUS
approved