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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.

A258394 Number of 2n-length strings of balanced parentheses of exactly 6 different types that are introduced in ascending order.

Table of values

n a(n)
6 132
7 9009
8 380380
9 12864852
10 383402292
11 10551322782
12 275335499824
13 6924802684800
14 169656773406120
15 4078556074277685
16 96700630711999860
17 2269529269318731420
18 52868514692841609300
19 1224857602490265215010
20 28265620407321158141280
21 650452332645092821924080

List of values

[132, 9009, 380380, 12864852, 383402292, 10551322782, 275335499824, 6924802684800, 169656773406120, 4078556074277685, 96700630711999860, 2269529269318731420, 52868514692841609300, 1224857602490265215010, 28265620407321158141280, 650452332645092821924080]

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

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