262303132

Appears in sequences

• Expansion of cosh(3*arctanh(2*sqrt(x))).at n=12A285043
• Expansion of ((1 + 2*x)/(1 - 2*x))^(3/2).at n=24A305031
• a(n) = ((n+1)^2 - 2) * binomial(2*n-2,n-1) / 2.at n=13A349427