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.

A208717 Number of n-bead necklaces labeled with numbers 1..4 allowing reversal, with no adjacent beads differing by more than 1.

Table of values

n a(n)
1 4
2 7
3 10
4 18
5 28
6 56
7 98
8 208
9 418
10 933
11 2044
12 4777
13 11072
14 26548
15 63672
16 155248
17 379348
18 935278
19 2311294
20 5741228
21 14292966
22 35699049
23 89339860
24 224097602
25 563074848
26 1417313897
27 3572747650
28 9019154944
29 22797181996
30 57693378135
31 146168107034
32 370712004868

List of values

[4, 7, 10, 18, 28, 56, 98, 208, 418, 933, 2044, 4777, 11072, 26548, 63672, 155248, 379348, 935278, 2311294, 5741228, 14292966, 35699049, 89339860, 224097602, 563074848, 1417313897, 3572747650, 9019154944, 22797181996, 57693378135, 146168107034, 370712004868]

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

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