249067

Appears in sequences

• G.f. A(x) satisfies: 1 = Sum_{n>=0} x^n*A(-x)^A001650(n+1), where A001650 is defined by "n appears n times (n odd).".at n=10A192455
• a(n) = Sum_{k=1..n} gcd(k, n)^4.at n=21A343498