cp's OEIS Frontend

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.

A054921 Number of connected unlabeled symmetric relations (graphs with loops) having n nodes.

Table of values

n a(n)
0 1
1 2
2 3
3 10
4 50
5 354
6 3883
7 67994
8 2038236
9 109141344
10 10693855251
11 1934271527050
12 648399961915988
13 404093642681273382
14 469756524755173254759
15 1022121472711196824292810
16 4176802133456105622904206409
17 32159648543645931290004658982846

List of values

[1, 2, 3, 10, 50, 354, 3883, 67994, 2038236, 109141344, 10693855251, 1934271527050, 648399961915988, 404093642681273382, 469756524755173254759, 1022121472711196824292810, 4176802133456105622904206409, 32159648543645931290004658982846]

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

Content is available under The OEIS End-User License Agreement.