29953728

Appears in sequences

• a(n) = n * binomial(2*n, n-1).at n=12A110609
• a(n) = Fibonacci(n) * Catalan(n).at n=12A119694
• Triangle read by rows, derived from a(n) = N*a(n-1) + a(n-2).at n=41A138765
• Number of valleys in all left factors of Dyck paths of length n. A valley is a (1,-1)-step followed by a (1,1)-step.at n=25A191522