Number of 2n-length strings of balanced parentheses of exactly 7 different types that are introduced in ascending order.

A258395

Number of 2n-length strings of balanced parentheses of exactly 7 different types that are introduced in ascending order.

Terms

    a(0) =429a(1) =40040a(2) =2246244a(3) =98760480a(4) =3761539782a(5) =130505896752

External references