OFFSET
1,4
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
FORMULA
a(1) = -1, for n > 1, a(n) = Sum_{d|n, d<n} A340197(n/d) * a(d).
PROG
CROSSREFS
KEYWORD
sign,less
AUTHOR
Antti Karttunen, Jan 05 2021
STATUS
approved