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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.

A337827 a(n) is the number of 2n-bead necklaces with exactly n different colored beads.

Table of values

n a(n)
1 1
2 4
3 91
4 5106
5 510312
6 79419180
7 17758541160
8 5397245416080
9 2140495978440960
10 1073686615987184640
11 664582969579048732800
12 497566995304189676342400
13 443212653988584642449548800
14 463237380681508395323231270400
15 561422444732790213860755013145600
16 780983354978825959061219179885824000

List of values

[1, 4, 91, 5106, 510312, 79419180, 17758541160, 5397245416080, 2140495978440960, 1073686615987184640, 664582969579048732800, 497566995304189676342400, 443212653988584642449548800, 463237380681508395323231270400, 561422444732790213860755013145600, 780983354978825959061219179885824000]

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

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