OFFSET
2,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 2..1000
FORMULA
E.g.f.: x^2/2! * Sum_{j=0..2} Stirling2(2,j)*exp(x)^j.
a(n) = C(n,2) * Sum_{j=0..2} Stirling2(2,j) * j^(n-2).
MAPLE
a:= n-> binomial(n, 2)*add(Stirling2(2, j)*j^(n-2), j=0..2):
seq(a(n), n=2..40);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 27 2016
STATUS
approved