OFFSET
0,9
COMMENTS
Conjecture: a(n) > 0 for all n > 10.
EXAMPLE
a(17) = 4 because we have [15, 2], [14, 3], [11, 6] and [10, 7].
MATHEMATICA
nmax = 100; CoefficientList[Series[(Sum[Boole[MoebiusMu[k] == 1] x^k, {k, 1, nmax}]) (Sum[Boole[MoebiusMu[k] == -1] x^k, {k, 1, nmax}]), {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, May 17 2017
STATUS
approved