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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.

A369197 Number of labeled connected loop-graphs with n vertices, none isolated, and at most n edges.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 95
5 972
6 12732
7 202751
8 3795864
9 81609030
10 1980107840
11 53497226337
12 1592294308992
13 51758060711792
14 1824081614046720
15 69272000503031475
16 2819906639193992192
17 122488526636380368714
18 5654657850859704139776
19 276462849597009068108405
20 14270030377126199463936000

List of values

[1, 1, 3, 13, 95, 972, 12732, 202751, 3795864, 81609030, 1980107840, 53497226337, 1592294308992, 51758060711792, 1824081614046720, 69272000503031475, 2819906639193992192, 122488526636380368714, 5654657850859704139776, 276462849597009068108405, 14270030377126199463936000]

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

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