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.

A032280 Number of bracelets (turnover necklaces) of n beads of 2 colors, 7 of them black.

Table of values

n a(n)
7 1
8 1
9 4
10 8
11 20
12 38
13 76
14 133
15 232
16 375
17 600
18 912
19 1368
20 1980
21 2829
22 3936
23 5412
24 7293
25 9724
26 12760
27 16588
28 21287
29 27092
30 34112
31 42640
32 52819
33 65008
34 79392
35 96405
36 116280
37 139536
38 166464
39 197676
40 233529
41 274740
42 321741
43 375364

List of values

[1, 1, 4, 8, 20, 38, 76, 133, 232, 375, 600, 912, 1368, 1980, 2829, 3936, 5412, 7293, 9724, 12760, 16588, 21287, 27092, 34112, 42640, 52819, 65008, 79392, 96405, 116280, 139536, 166464, 197676, 233529, 274740, 321741, 375364]

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

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