A258393 - cp's OEIS frontend

A258393 Number of 2n-length strings of balanced parentheses of exactly 5 different types that are introduced in ascending order.

n	a(n)
5	42
6	1980
7	60060
8	1501500
9	33795762
10	714249900
11	14504269780
12	286931752800
13	5578065392900
14	107178276605400
15	2043352620527400
16	38758743724018500
17	732849800716048290
18	13831507110589591500
19	260829110106412824900
20	4917878997439418010000
21	92758042341429880435020

[42, 1980, 60060, 1501500, 33795762, 714249900, 14504269780, 286931752800, 5578065392900, 107178276605400, 2043352620527400, 38758743724018500, 732849800716048290, 13831507110589591500, 260829110106412824900, 4917878997439418010000, 92758042341429880435020]

cp's OEIS Frontend

A258393 Number of 2n-length strings of balanced parentheses of exactly 5 different types that are introduced in ascending order.

Table of values

List of values