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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.

A099718 Consider the family of directed multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n labeled loops and edges.

Table of values

n a(n)
0 1
1 2
2 15
3 207
4 4274
5 120698
6 4408714
7 200482089
8 11035845002
9 719691942986
10 54661283926338
11 4768412660292713
12 472309503983879356
13 52604316569196875434
14 6533611563916740388476
15 898472724512273277951811
16 135941600045496082012663932
17 22505828691354514668620263242

List of values

[1, 2, 15, 207, 4274, 120698, 4408714, 200482089, 11035845002, 719691942986, 54661283926338, 4768412660292713, 472309503983879356, 52604316569196875434, 6533611563916740388476, 898472724512273277951811, 135941600045496082012663932, 22505828691354514668620263242]

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

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