2481880320

Appears in sequences

• a(n) = n*binomial(2*n-2, n-1).at n=16A037965
• a(n) = x(n) * 2^((n mod 2 - 1)/2), with x(n)=Sum(x(k)*x(n-k-1):0<=k<n), x(0)=SQRT(2).at n=15A137697
• Row sums of the extended Catalan triangle A189231.at n=30A189911