OFFSET
1,3
COMMENTS
REFERENCES
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
FORMULA
a(n) = sum( d divides n, mu(d) * A056415(n/d) ).
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Added more terms (from A002730), Joerg Arndt, Aug 27 2014
STATUS
approved