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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.

A208669 Number of 2n-bead necklaces labeled with numbers 1..6 allowing reversal, with neighbors differing by exactly 1.

Table of values

n a(n)
1 5
2 9
3 16
4 32
5 65
6 152
7 360
8 937
9 2512
10 7034
11 20124
12 58899
13 174408
14 522453
15 1576468
16 4787425
17 14607763
18 44758541
19 137607258
20 424343533
21 1311982883
22 4065937220
23 12627227963
24 39290663343
25 122470374536
26 382359843141
27 1195524220166
28 3743191124783

List of values

[5, 9, 16, 32, 65, 152, 360, 937, 2512, 7034, 20124, 58899, 174408, 522453, 1576468, 4787425, 14607763, 44758541, 137607258, 424343533, 1311982883, 4065937220, 12627227963, 39290663343, 122470374536, 382359843141, 1195524220166, 3743191124783]

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

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