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.

A115117 Number of primitive (aperiodic, or Lyndon) 3-asymmetric rhythm cycles: ones having no nontrivial shift automorphism. 3-asymmetric rhythm cycles (A115115): binary necklaces of length 3n subject to the restriction that for any k if the k-th bead is of color 1 then the (k+n)-th and (k+2n)-th beads (modulo 3n) are of color 0.

Table of values

n a(n)
1 1
2 2
3 7
4 20
5 68
6 224
7 780
8 2720
9 9709
10 34918
11 127100
12 465920
13 1720740
14 6390930
15 23860928
16 89477120
17 336860180
18 1272578048
19 4822419420
20 18325176316
21 69810262080
22 266548209850
23 1019836872140
24 3909374443520
25 15011998757888

List of values

[1, 2, 7, 20, 68, 224, 780, 2720, 9709, 34918, 127100, 465920, 1720740, 6390930, 23860928, 89477120, 336860180, 1272578048, 4822419420, 18325176316, 69810262080, 266548209850, 1019836872140, 3909374443520, 15011998757888]

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

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