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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.

A322151 Number of labeled connected graphs with loops with n edges (the vertices are {1,2,...,k} for some k).

Table of values

n a(n)
0 1
1 2
2 5
3 27
4 216
5 2311
6 30988
7 499919
8 9431026
9 203743252
10 4960335470
11 134382267082
12 4009794148101
13 130668970606412
14 4617468180528235
15 175867725701333896
16 7182126650899080024
17 313063334893103361130
18 14507460736615554141354
19 712192629608088061633746

List of values

[1, 2, 5, 27, 216, 2311, 30988, 499919, 9431026, 203743252, 4960335470, 134382267082, 4009794148101, 130668970606412, 4617468180528235, 175867725701333896, 7182126650899080024, 313063334893103361130, 14507460736615554141354, 712192629608088061633746]

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

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