581690700

Appears in sequences

• Expansion of 1/(2*x) * (1/(1-4*x)^(3/2)-1).at n=13A033876
• a(1) = 1. a(n) = n*a(n-1) if gcd(n,a(n-1)) = 1, a(n-1)/n if n divides a(n-1), otherwise a(n) = a(n-1).at n=28A068629
• Number of polygons on n vertices with exactly three faces.at n=15A128650
• a(n) = 2^n*binomial((n + 1 + (n mod 2))/2, 1/2).at n=27A242172
• Expansion of (x*(1-4*x^2)^(-3/2) + (1-4*x^2)^(-1/2) + x + 1)/2.at n=29A275324