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.

A209027 Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero and first differences in -3..3.

Table of values

n a(n)
1 1
2 2
3 4
4 12
5 34
6 144
7 576
8 2613
9 11841
10 55773
11 265095
12 1280476
13 6238246
14 30674021
15 151874427
16 756842052
17 3792315084
18 19096602857
19 96586072494
20 490453174481
21 2499410534082
22 12778951549191
23 65530990963959
24 336965088080673
25 1737060054201011
26 8975377470866966

List of values

[1, 2, 4, 12, 34, 144, 576, 2613, 11841, 55773, 265095, 1280476, 6238246, 30674021, 151874427, 756842052, 3792315084, 19096602857, 96586072494, 490453174481, 2499410534082, 12778951549191, 65530990963959, 336965088080673, 1737060054201011, 8975377470866966]

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

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