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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.

A320745 Number of chiral pairs of color patterns (set partitions) in a cycle of length n using 5 or fewer colors (subsets).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 6
7 34
8 181
9 871
10 4016
11 18526
12 85101
13 393148
14 1822977
15 8500893
16 39809180
17 187230704
18 883730048
19 4184926222
20 19874478310
21 94629276256
22 451604739323
23 2159748985582
24 10348493650194
25 49671898709098
26 238804606717950
27 1149792470325340
28 5543620159707666
29 26762240285558924
30 129350640352555296
31 625889650880647630
32 3031651402693863747
33 14698911258326292182
34 71332938143655936584
35 346474231506471943759

List of values

[0, 0, 0, 0, 0, 6, 34, 181, 871, 4016, 18526, 85101, 393148, 1822977, 8500893, 39809180, 187230704, 883730048, 4184926222, 19874478310, 94629276256, 451604739323, 2159748985582, 10348493650194, 49671898709098, 238804606717950, 1149792470325340, 5543620159707666, 26762240285558924, 129350640352555296, 625889650880647630, 3031651402693863747, 14698911258326292182, 71332938143655936584, 346474231506471943759]

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

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