1774630

Appears in sequences

• Expansion of 1/2 * (((1 + 2*x)/(1 - 2*x))^(3/2) - 1).at n=18A305612
• a(n) = Sum_{k=0..n} (-1)^k * binomial(-n,k) * binomial(2*k,n-k).at n=9A362087