181610

Appears in sequences

• Numbers n such that 237*2^n-1 is prime.at n=45A050877
• Number T(n,k) of 2n-length strings of balanced parentheses of exactly k different types that are introduced in ascending order; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=38A253180
• Number of 2n-length strings of balanced parentheses of exactly 2 different types that are introduced in ascending order.at n=6A258390
• a(n) = Catalan(n)*Motzkin(n-1).at n=7A290443