OFFSET
1,2
LINKS
FORMULA
a(1)=0; a(n)= n*(n+1)^(n-2), n >= 2.
E.g.f.: -1/2*(-W(-x)^2+x^2)/x, W(x) principal branch of Lambert's function.
a(n)=A055864(n, 2).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang Jun 20 2000
STATUS
approved