OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..10000
FORMULA
a(n) = 1 + Sum_{k=1..n} binomial(abs(mu(2*k)), abs(mu(k))).
MATHEMATICA
a[n_]:=Binomial[Abs[MoebiusMu[2n]], Abs[MoebiusMu[n]]]; Accumulate[Table[a[n], {n, 0, 72}]] (* James C. McMahon, Jan 22 2024 *)
PROG
(PARI) seq(n) = {my(v=vector(1+n)); v[1]=1; for(k=1, n, v[1+k] = v[k] + binomial(abs(moebius(2*k)), abs(moebius(k)))); v} \\ Andrew Howroyd, Jan 22 2024
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 14 2005
STATUS
approved