OFFSET
1,1
LINKS
L. Q. Eifler, K. B. Reid Jr., D. P. Roselle, Sequences with adjacent elements unequal, Aequationes Mathematicae 6 (2-3), 1971.
Max Alekseyev, PARI scripts for various problems
FORMULA
a(n) = Sum_{d|n} moebius(n/d) * A141147(d) / n.
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, Jun 10 2008
STATUS
approved