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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.

A115119 Number of imprimitive (periodic) n-bead necklaces with beads of 2 colors when turning over is allowed.

Table of values

n a(n)
0 0
1 0
2 2
3 2
4 3
5 2
6 5
7 2
8 6
9 4
10 9
11 2
12 16
13 2
14 19
15 10
16 30
17 2
18 55
19 2
20 81
21 20
22 127
23 2
24 248
25 8
26 381
27 46
28 690
29 2
30 1302
31 2
32 2250
33 128
34 4113
35 24
36 7896
37 2
38 14311
39 382
40 27036
41 2
42 51641
43 2
44 96912
45 1266
46 184411
47 2
48 354918
49 18
50 675258
51 4114
52 1296861
53 2
54 2501365
55 132
56 4806102
57 14312

List of values

[0, 0, 2, 2, 3, 2, 5, 2, 6, 4, 9, 2, 16, 2, 19, 10, 30, 2, 55, 2, 81, 20, 127, 2, 248, 8, 381, 46, 690, 2, 1302, 2, 2250, 128, 4113, 24, 7896, 2, 14311, 382, 27036, 2, 51641, 2, 96912, 1266, 184411, 2, 354918, 18, 675258, 4114, 1296861, 2, 2501365, 132, 4806102, 14312]

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

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