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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.

A136722 Number of preferential arrangements (or hierarchical orderings) on the connected graphs on n unlabeled nodes.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 48
5 336
6 3584
7 54592
8 1422976
9 66836480
10 5998884352
11 1030861378560
12 335994532814848
13 206175878632321024
14 237596569295651315712
15 514414692643000188272640
16 2096154545790162572944244736
17 16113456361117058761983824232448
18 234269143891823701379016369973493760

List of values

[1, 1, 2, 8, 48, 336, 3584, 54592, 1422976, 66836480, 5998884352, 1030861378560, 335994532814848, 206175878632321024, 237596569295651315712, 514414692643000188272640, 2096154545790162572944244736, 16113456361117058761983824232448, 234269143891823701379016369973493760]

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

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