OFFSET
1,5
FORMULA
a(i)=0 for i=1..4; a(n)= n^4*(n+1)^(n-5), n >= 5.
E.g.f.: (270*W(-x)^2-740*W(-x)^3+345*W(-x)^4-36*W(-x)^5-270*x^2-1280*x^3-3645*x^4-9216*x^5)/(4320*x), W(x) principal branch of Lambert's function.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang Jun 20 2000
STATUS
approved