cp's OEIS Frontend

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.

A284856 Array read by antidiagonals: T(n,k) = number of aperiodic necklaces (Lyndon words) with n beads and k colors that are the same when turned over.

Table of values

n a(n)
1 1
2 2
3 0
4 3
5 1
6 0
7 4
8 3
9 2
10 0
11 5
12 6
13 6
14 3
15 0
16 6
17 10
18 12
19 12
20 6
21 0
22 7
23 15
24 20
25 30
26 24
27 7
28 0
29 8
30 21
31 30
32 60
33 60
34 42
35 14
36 0
37 9
38 28
39 42
40 105
41 120
42 138
43 78
44 18
45 0
46 10
47 36
48 56
49 168
50 210
51 340
52 252
53 144
54 28
55 0
56 11
57 45
58 72
59 252
60 336
61 705
62 620
63 600
64 234
65 39
66 0

List of values

[1, 2, 0, 3, 1, 0, 4, 3, 2, 0, 5, 6, 6, 3, 0, 6, 10, 12, 12, 6, 0, 7, 15, 20, 30, 24, 7, 0, 8, 21, 30, 60, 60, 42, 14, 0, 9, 28, 42, 105, 120, 138, 78, 18, 0, 10, 36, 56, 168, 210, 340, 252, 144, 28, 0, 11, 45, 72, 252, 336, 705, 620, 600, 234, 39, 0]

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

Content is available under The OEIS End-User License Agreement.