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.

A208716 Number of n-bead necklaces labeled with numbers 1..3 allowing reversal, with no adjacent beads differing by more than 1.

Table of values

n a(n)
1 3
2 5
3 7
4 12
5 18
6 34
7 56
8 111
9 207
10 427
11 859
12 1851
13 3930
14 8672
15 19092
16 42845
17 96243
18 218567
19 497183
20 1138084
21 2610226
22 6009662
23 13861968
24 32057868
25 74260243
26 172351415
27 400589343
28 932486879
29 2173368730
30 5071877864
31 11849063220
32 27711739481

List of values

[3, 5, 7, 12, 18, 34, 56, 111, 207, 427, 859, 1851, 3930, 8672, 19092, 42845, 96243, 218567, 497183, 1138084, 2610226, 6009662, 13861968, 32057868, 74260243, 172351415, 400589343, 932486879, 2173368730, 5071877864, 11849063220, 27711739481]

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

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