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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.

A320743 Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 3 or fewer colors (subsets).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 4
7 13
8 46
9 144
10 420
11 1221
12 3474
13 9856
14 27794
15 78632
16 222156
17 629760
18 1787440
19 5087797
20 14509580
21 41479867
22 118811286
23 341009901
24 980488510
25 2824029648
26 8146494860
27 23534997912
28 68084154502
29 197211336576
30 571915188840
31 1660405181149
32 4825559508106
33 14038010213051
34 40875403561680
35 119122661856133
36 347441159864556
37 1014152747485696

List of values

[0, 0, 0, 0, 0, 4, 13, 46, 144, 420, 1221, 3474, 9856, 27794, 78632, 222156, 629760, 1787440, 5087797, 14509580, 41479867, 118811286, 341009901, 980488510, 2824029648, 8146494860, 23534997912, 68084154502, 197211336576, 571915188840, 1660405181149, 4825559508106, 14038010213051, 40875403561680, 119122661856133, 347441159864556, 1014152747485696]

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

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