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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.

A258395 Number of 2n-length strings of balanced parentheses of exactly 7 different types that are introduced in ascending order.

Table of values

n a(n)
7 429
8 40040
9 2246244
10 98760480
11 3761539782
12 130505896752
13 4245988489600
14 131928199603200
15 3962683868528385
16 116039722090972680
17 3332921846278964940
18 94315723869947580000
19 2638390752595156276410
20 73147630662437905413840
21 2013841857892713303414960

List of values

[429, 40040, 2246244, 98760480, 3761539782, 130505896752, 4245988489600, 131928199603200, 3962683868528385, 116039722090972680, 3332921846278964940, 94315723869947580000, 2638390752595156276410, 73147630662437905413840, 2013841857892713303414960]

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

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