Number of 2n-length strings of balanced parentheses of exactly 5 different types that are introduced in ascending order.
A258393
Number of 2n-length strings of balanced parentheses of exactly 5 different types that are introduced in ascending order.
Terms
- a(0) =42a(1) =1980a(2) =60060a(3) =1501500a(4) =33795762a(5) =714249900a(6) =14504269780a(7) =286931752800
External references
- oeis: A258393