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.

A208773 Number of n-bead necklaces labeled with numbers 1..4 not 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 30
6 65
7 128
8 293
9 658
10 1544
11 3622
12 8711
13 20924
14 50889
15 124150
16 304718
17 750334
18 1855429
19 4600696
20 11442853
21 28528618
22 71294416
23 178529670
24 447923761
25 1125756860
26 2833917147
27 7144466842
28 18036449390
29 45591671454
30 115381885423
31 292329164912
32 741411257693
33 1882219950046
34 4782783122992
35 12163730636250

List of values

[4, 7, 10, 18, 30, 65, 128, 293, 658, 1544, 3622, 8711, 20924, 50889, 124150, 304718, 750334, 1855429, 4600696, 11442853, 28528618, 71294416, 178529670, 447923761, 1125756860, 2833917147, 7144466842, 18036449390, 45591671454, 115381885423, 292329164912, 741411257693, 1882219950046, 4782783122992, 12163730636250]

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

Content is available under The OEIS End-User License Agreement.