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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.

A189976 a(n) is the number of incongruent two-color bracelets of n beads, 8 of them black (A005514), having a diameter of symmetry.

Table of values

n a(n)
8 1
9 1
10 5
11 5
12 15
13 15
14 35
15 35
16 70
17 70
18 126
19 126
20 210
21 210
22 330
23 330
24 495
25 495
26 715
27 715
28 1001
29 1001
30 1365
31 1365
32 1820
33 1820
34 2380
35 2380
36 3060
37 3060
38 3876
39 3876
40 4845
41 4845
42 5985
43 5985
44 7315
45 7315
46 8855
47 8855
48 10626

List of values

[1, 1, 5, 5, 15, 15, 35, 35, 70, 70, 126, 126, 210, 210, 330, 330, 495, 495, 715, 715, 1001, 1001, 1365, 1365, 1820, 1820, 2380, 2380, 3060, 3060, 3876, 3876, 4845, 4845, 5985, 5985, 7315, 7315, 8855, 8855, 10626]

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

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