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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.

A274847 a(n) = number of similarity classes of groups with exactly n subgroups (see reference for precise definition of similarity classes).

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 2
6 5
7 1
8 7
9 2
10 12
11 4
12 11
13 1
14 17
15 8
16 22
17 3
18 22
19 5

List of values

[1, 1, 1, 2, 2, 5, 1, 7, 2, 12, 4, 11, 1, 17, 8, 22, 3, 22, 5]