OFFSET
0,3
FORMULA
a(n) ~ c * n!, where c = Product_{k>=2} 1/(1 - mu(k)^2 / k!) = 2.424015771296779544901862396932865784522634598161012752425646675020312449... - Vaclav Kotesovec, Mar 28 2024
MATHEMATICA
nmax = 22; CoefficientList[Series[Product[1/(1 - MoebiusMu[k]^2 x^k/k!), {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Mar 27 2024
STATUS
approved