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.

A208724 Number of 2n-bead necklaces labeled with numbers 1..5 not allowing reversal, with neighbors differing by exactly 1.

Table of values

n a(n)
1 4
2 7
3 12
4 25
5 52
6 131
7 316
8 835
9 2196
10 5935
11 16108
12 44369
13 122644
14 341803
15 956636
16 2690845
17 7596484
18 21524543
19 61171660
20 174342217
21 498112276
22 1426419859
23 4093181692
24 11767920119
25 33891544420
26 97764131647
27 282429537948
28 817028472961
29 2366564736724
30 6863038218843

List of values

[4, 7, 12, 25, 52, 131, 316, 835, 2196, 5935, 16108, 44369, 122644, 341803, 956636, 2690845, 7596484, 21524543, 61171660, 174342217, 498112276, 1426419859, 4093181692, 11767920119, 33891544420, 97764131647, 282429537948, 817028472961, 2366564736724, 6863038218843]

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

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