OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..443
Wikipedia, Permutation
FORMULA
E.g.f.: (1-exp(-x))/(1-x)^9.
a(n) = -1/8! * Sum_{j=1..n} (-1)^j * binomial(n,j) * (n+8-j)!.
a(n) = A306234(n+8,8).
MAPLE
a:= n-> (k-> -add((-1)^j*binomial(n, j)*(n+k-j)!, j=1..n)/k!)(8):
seq(a(n), n=0..23);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 23 2019
STATUS
approved