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.

A208542 Number of n-bead necklaces of 6 colors allowing reversal, with no adjacent beads having the same color.

Table of values

n a(n)
1 6
2 15
3 20
4 120
5 312
6 1505
7 5580
8 25395
9 108520
10 493131
11 2219460
12 10196680
13 46950120
14 218102685
15 1017252828
16 4768969770
17 22439395680
18 105966797755
19 501933850740
20 2384200683816
21 11353265675240
22 54186115056825
23 259150629458220
24 1241763804134805

List of values

[6, 15, 20, 120, 312, 1505, 5580, 25395, 108520, 493131, 2219460, 10196680, 46950120, 218102685, 1017252828, 4768969770, 22439395680, 105966797755, 501933850740, 2384200683816, 11353265675240, 54186115056825, 259150629458220, 1241763804134805]

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

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