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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.

A328741 Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using exactly four different colored beads.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 2
6 9
7 50
8 206
9 862
10 3384
11 13250
12 50852
13 194810
14 741884
15 2823712
16 10735998
17 40843370
18 155483873
19 592614050
20 2261585918
21 8643288808
22 33080772468
23 126797503250
24 486710415710
25 1870851589552
26 7201012694120
27 27752927349880
28 107092389688830
29 413729680838330

List of values

[0, 0, 0, 0, 2, 9, 50, 206, 862, 3384, 13250, 50852, 194810, 741884, 2823712, 10735998, 40843370, 155483873, 592614050, 2261585918, 8643288808, 33080772468, 126797503250, 486710415710, 1870851589552, 7201012694120, 27752927349880, 107092389688830, 413729680838330]

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

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