836550

Appears in sequences

• Expansion of cosh(3*arctanh(2*sqrt(x))).at n=8A285043
• Expansion of ((1 + 2*x)/(1 - 2*x))^(3/2).at n=16A305031
• a(n) = 4^n*binomial(n - 1/2, -1/2)*(n^2 + 1).at n=8A344399