128996853

Appears in sequences

• Central trinomial coefficients: largest coefficient of (1 + x + x^2)^n.at n=19A002426
• Number of symmetric, reduced unit interval schemes with n+1 intervals (n>=1).at n=38A005213
• a(n) = Sum_{k=0..n} binomial(2*k, k) * binomial(2*n+1, 2*k).at n=9A273055