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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.

A328039 Number of primitive (period n) n-bead bracelet structures which are not periodic palindromes using exactly four different colored beads.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 10
7 32
8 129
9 468
10 1806
11 6780
12 25917
13 98056
14 372919
15 1414548
16 5375974
17 20432480
18 77773845
19 296350460
20 1130919576
21 4321818986
22 16540888897
23 63399449652
24 243357204415
25 935428588930
26 3600514267686
27 13876474860110
28 53546226302319
29 206864885150216

List of values

[0, 0, 0, 1, 2, 10, 32, 129, 468, 1806, 6780, 25917, 98056, 372919, 1414548, 5375974, 20432480, 77773845, 296350460, 1130919576, 4321818986, 16540888897, 63399449652, 243357204415, 935428588930, 3600514267686, 13876474860110, 53546226302319, 206864885150216]

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

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