OFFSET
0,3
COMMENTS
Diagonal sums of A098509.
FORMULA
a(n)=sum{k=0..floor(n/2), denominator((n-k+1)Binomial(n-k, k)/Binomial(2(n-k), n-k))}
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Sep 11 2004
STATUS
approved