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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.

A304976 Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 6 colors (sets).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 1
7 3
8 18
9 46
10 195
11 461
12 1696
13 3836
14 13097
15 28819
16 94094
17 203322
18 644911
19 1376217
20 4279692
21 9051592
22 27755013
23 58319855
24 176992090
25 370087718
26 1114496747
27 2321721493
28 6950406008
29 14437363668
30 43021681249
31 89162536011
32 264732674406
33 547676535634

List of values

[0, 0, 0, 0, 0, 0, 1, 3, 18, 46, 195, 461, 1696, 3836, 13097, 28819, 94094, 203322, 644911, 1376217, 4279692, 9051592, 27755013, 58319855, 176992090, 370087718, 1114496747, 2321721493, 6950406008, 14437363668, 43021681249, 89162536011, 264732674406, 547676535634]

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

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