OFFSET
1,2
FORMULA
a(n)=sum(A000369(n,m)*(-1)^(m-1),m=1..n)
E.g.f.: 1-exp(-(1-(1-4*x)^(1/4))).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang Sep 14 2007
STATUS
approved