2645370

Appears in sequences

• a(n) = C(n)*(4*n+1) where C(n) = Catalan numbers (A000108).at n=11A051944
• Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k).at n=21A100561
• Expansion of (1+x*c(x^2))^3/sqrt(1-4*x^2), c(x) the g.f. of A000108.at n=22A107232
• Numbers with prime factorization pqrstuv^2.at n=23A190381
• Indices k of records of low value in the ratios A348158(k)/k.at n=8A348159