OFFSET
0,8
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..450
FORMULA
a(n) = n! * (1 - sum_{k=0..floor(n/7)} (-1)^k/(k!*7^k)).
a(n)/n! is asymptotic to 1-e^(-1/7) = 1 - A092750.
E.g.f.: (1-exp(-x^7/7))/(1-x). - Alois P. Heinz, Oct 11 2017
PROG
(PARI) a(n) = n! * (1 - sum(k=0, floor(n/7), (-1)^k/(k!*7^k) ) ); \\ Michel Marcus, Aug 08 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved