cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A258399 Number of 4n-length strings of balanced parentheses of exactly n different types that are introduced in ascending order.

Table of values

n a(n)
0 1
1 2
2 98
3 11880
4 2432430
5 714249900
6 275335499824
7 131928199603200
8 75727786603836510
9 50713478000403718500
10 38843740303576863755100
11 33508462196084294380001040
12 32157574295254903735909896240
13 33990046387543889224733323929120

List of values

[1, 2, 98, 11880, 2432430, 714249900, 275335499824, 131928199603200, 75727786603836510, 50713478000403718500, 38843740303576863755100, 33508462196084294380001040, 32157574295254903735909896240, 33990046387543889224733323929120]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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