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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.

A320154 Number of series-reduced balanced rooted trees whose leaves form a set partition of {1,...,n}.

Table of values

n a(n)
1 1
2 2
3 5
4 18
5 92
6 588
7 4328
8 35920
9 338437
10 3654751
11 45105744
12 625582147
13 9539374171
14 157031052142
15 2757275781918
16 51293875591794
17 1007329489077804
18 20840741773898303
19 453654220906310222
20 10380640686263467204
21 249559854371799622350
22 6301679967177242849680

List of values

[1, 2, 5, 18, 92, 588, 4328, 35920, 338437, 3654751, 45105744, 625582147, 9539374171, 157031052142, 2757275781918, 51293875591794, 1007329489077804, 20840741773898303, 453654220906310222, 10380640686263467204, 249559854371799622350, 6301679967177242849680]

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

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