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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.

A328742 Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using a maximum of three different colored beads.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 2
5 8
6 17
7 52
8 130
9 363
10 968
11 2684
12 7338
13 20440
14 56836
15 159424
16 448130
17 1266080
18 3586479
19 10195276
20 29054568
21 83018624
22 237729932
23 682196948
24 1961301330
25 5648590728
26 16293970840
27 47071589049
28 136171269780
29 394427456120
30 1143839302904
31 3320824711204

List of values

[1, 1, 0, 1, 2, 8, 17, 52, 130, 363, 968, 2684, 7338, 20440, 56836, 159424, 448130, 1266080, 3586479, 10195276, 29054568, 83018624, 237729932, 682196948, 1961301330, 5648590728, 16293970840, 47071589049, 136171269780, 394427456120, 1143839302904, 3320824711204]

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

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