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.

A056305 Number of primitive (period n) n-bead necklace structures using exactly four different colored beads.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 13
7 50
8 220
9 866
10 3435
11 13250
12 51061
13 194810
14 742601
15 2823764
16 10738660
17 40843370
18 155493872
19 592614050
20 2261622287
21 8643289484
22 33080907357
23 126797503250
24 486710920300
25 1870851589552

List of values

[0, 0, 0, 1, 2, 13, 50, 220, 866, 3435, 13250, 51061, 194810, 742601, 2823764, 10738660, 40843370, 155493872, 592614050, 2261622287, 8643289484, 33080907357, 126797503250, 486710920300, 1870851589552]

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

Content is available under The OEIS End-User License Agreement.