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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.

A320749 Number of chiral pairs of color patterns (set partitions) in a cycle of length n.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 6
7 34
8 190
9 1011
10 5352
11 29740
12 172466
13 1055232
14 6793791
15 46034940
16 327303819
17 2436650368
18 18944771253
19 153488081102
20 1293086505784
21 11306373089104
22 102425178180769
23 959825673145688
24 9290807818971900
25 92771800581171418
26 954447025978145744
27 10105871186441842623
28 110009631951698573068
29 1229996584263621368224
30 14112483571723367245825
31 166021918475962174194914
32 2001010469483653602192695

List of values

[0, 0, 0, 0, 0, 6, 34, 190, 1011, 5352, 29740, 172466, 1055232, 6793791, 46034940, 327303819, 2436650368, 18944771253, 153488081102, 1293086505784, 11306373089104, 102425178180769, 959825673145688, 9290807818971900, 92771800581171418, 954447025978145744, 10105871186441842623, 110009631951698573068, 1229996584263621368224, 14112483571723367245825, 166021918475962174194914, 2001010469483653602192695]

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

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