OFFSET
0,4
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..200
FORMULA
a(n) = Sum_{d|n} mu(n/d)*A000670(ceiling(d/2)) for n > 0.
PROG
(PARI) a(n) = {if(n<1, n==0, sumdiv(n, d, moebius(n/d)*sum(k=1, ceil(d/2), k!*stirling(ceil(d/2), k, 2))))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Sep 28 2019
STATUS
approved