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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.

A208533 Number of n-bead necklaces of n colors not allowing reversal, with no adjacent beads having the same color.

Table of values

n a(n)
1 1
2 1
3 2
4 24
5 204
6 2635
7 39990
8 720916
9 14913192
10 348684381
11 9090909090
12 261535848376
13 8230246567620
14 281241174889207
15 10371206370593250
16 410525522392242720
17 17361641481138401520
18 781282469565908953017
19 37275544492386193492506
20 1879498672877604463254424

List of values

[1, 1, 2, 24, 204, 2635, 39990, 720916, 14913192, 348684381, 9090909090, 261535848376, 8230246567620, 281241174889207, 10371206370593250, 410525522392242720, 17361641481138401520, 781282469565908953017, 37275544492386193492506, 1879498672877604463254424]

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

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