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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.

A305752 Number of achiral color patterns (set partitions) in a row or cycle of length n with 6 or fewer colors (subsets).

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 7
5 12
6 31
7 58
8 159
9 312
10 883
11 1774
12 5103
13 10368
14 30067
15 61414
16 178815
17 366168
18 1068259
19 2190190
20 6395919
21 13120944
22 38335123
23 78665590
24 229890591
25 471814344
26 1378985155
27 2830350526
28 8272839855
29 16980500640
30 49633834099
31 101878204486

List of values

[1, 1, 2, 3, 7, 12, 31, 58, 159, 312, 883, 1774, 5103, 10368, 30067, 61414, 178815, 366168, 1068259, 2190190, 6395919, 13120944, 38335123, 78665590, 229890591, 471814344, 1378985155, 2830350526, 8272839855, 16980500640, 49633834099, 101878204486]

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

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