168043980

Appears in sequences

• Coefficients of power series that satisfies A(x)^2 - 4*x*A(x)^3 = 1, A(0)=1.at n=10A078531
• Number of symmetric non-crossing connected graphs on n equidistant nodes on a circle.at n=20A089073
• a(n) = (30*n)!*(5*n)!*(4*n)!/((15*n)!*(12*n)!*(10*n)!*(2*n)!).at n=1A295456
• a(n) = (15*n)!*(5*n/2)!*(2*n)!/((15*n/2)!*(6*n)!*(5*n)!*n!).at n=2A364176