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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.

A208776 Number of n-bead necklaces labeled with numbers 1..7 not allowing reversal, with no adjacent beads differing by more than 1.

Table of values

n a(n)
1 7
2 13
3 19
4 36
5 63
6 143
7 299
8 719
9 1711
10 4249
11 10611
12 27144
13 69727
14 181467
15 475147
16 1253475
17 3324103
18 8862889
19 23729747
20 63791064
21 172066959
22 465577215
23 1263208683
24 3435919395
25 9366558151
26 25585896137
27 70019831931
28 191943278804
29 526978629663
30 1448862872667
31 3988658225035
32 10993823704779
33 30335737469495
34 83793424341677

List of values

[7, 13, 19, 36, 63, 143, 299, 719, 1711, 4249, 10611, 27144, 69727, 181467, 475147, 1253475, 3324103, 8862889, 23729747, 63791064, 172066959, 465577215, 1263208683, 3435919395, 9366558151, 25585896137, 70019831931, 191943278804, 526978629663, 1448862872667, 3988658225035, 10993823704779, 30335737469495, 83793424341677]

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

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