OFFSET
1,3
LINKS
Paolo P. Lava, Table of n, a(n) for n = 1..2500
FORMULA
a(n) seems to be asymptotic to c*n^2 with c around 0.18...
PROG
(PARI) a(n)=sum(k=1, n, binomial(n, k)%k)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Oct 19 2002
STATUS
approved