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.

A328740 Number of n-bead necklace structures which are not self-equivalent under a nonzero rotation using exactly three different colored beads.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 5
6 13
7 43
8 116
9 335
10 920
11 2591
12 7173
13 20125
14 56260
15 158333
16 446098
17 1262225
18 3579227
19 10181479
20 29028405
21 82968695
22 237634700
23 682014587
24 1960951980
25 5647919640
26 16292680600
27 47069103545
28 136166476875
29 394418199725
30 1143821408316
31 3320790074371

List of values

[0, 0, 0, 1, 5, 13, 43, 116, 335, 920, 2591, 7173, 20125, 56260, 158333, 446098, 1262225, 3579227, 10181479, 29028405, 82968695, 237634700, 682014587, 1960951980, 5647919640, 16292680600, 47069103545, 136166476875, 394418199725, 1143821408316, 3320790074371]

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

Content is available under The OEIS End-User License Agreement.