OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..1000
FORMULA
Inverse Moebius transform of A045662. - Andrew Howroyd, Sep 15 2019
PROG
(PARI) c(n)={sumdiv(n, d, moebius(d)*d)} \\ A023900
a(n)={if(n<1, n==0, 2*sumdiv(n, d, c(n/d) * d * binomial(d-d%2, d\2)))} \\ Andrew Howroyd, Sep 15 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(30) and beyond from Andrew Howroyd, Sep 15 2019
STATUS
approved