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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.

A056303 Number of primitive (period n) n-bead necklace structures using exactly two different colored beads.

Table of values

n a(n)
1 0
2 1
3 1
4 2
5 3
6 5
7 9
8 16
9 28
10 51
11 93
12 170
13 315
14 585
15 1091
16 2048
17 3855
18 7280
19 13797
20 26214
21 49929
22 95325
23 182361
24 349520
25 671088
26 1290555
27 2485504
28 4793490
29 9256395
30 17895679
31 34636833
32 67108864
33 130150493
34 252645135
35 490853403
36 954437120
37 1857283155

List of values

[0, 1, 1, 2, 3, 5, 9, 16, 28, 51, 93, 170, 315, 585, 1091, 2048, 3855, 7280, 13797, 26214, 49929, 95325, 182361, 349520, 671088, 1290555, 2485504, 4793490, 9256395, 17895679, 34636833, 67108864, 130150493, 252645135, 490853403, 954437120, 1857283155]

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

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