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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.

A320646 Number of chiral pairs of color patterns (set partitions) in a cycle of length n using exactly 6 colors (subsets).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 9
9 125
10 1054
11 7928
12 54383
13 356594
14 2259504
15 14008733
16 85422360
17 514773336
18 3074341497
19 18238301412
20 107649939612
21 632987843336
22 3711471738408
23 21716706883190
24 126879832615600
25 740528154956264
26 4319137675225128
27 25181504728152534
28 146788320134425736
29 855660631677225738
30 4988501691655508510
31 29089896998939710698

List of values

[0, 0, 0, 0, 0, 0, 0, 9, 125, 1054, 7928, 54383, 356594, 2259504, 14008733, 85422360, 514773336, 3074341497, 18238301412, 107649939612, 632987843336, 3711471738408, 21716706883190, 126879832615600, 740528154956264, 4319137675225128, 25181504728152534, 146788320134425736, 855660631677225738, 4988501691655508510, 29089896998939710698]

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

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