52657

Appears in sequences

• a(n) is the number of terms in the expansion of (x+y-z)*(x^2+y^2-z^2)*(x^3+y^3-z^3)*...*(x^n+y^n-z^n).at n=24A086817
• a(n) = Sum_{k=1..n} phi(gcd(k, n))^(n/gcd(k, n) - 1).at n=51A342542