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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.

A045611 Number of different energy states of n positive and n negative charges on a necklace. Different sets of distances between n points chosen from 2n equally spaced points on a circle.

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 7
5 13
6 35
7 85
8 254
9 701
10 2377
11 7944
12 25220
13 95910
14 332300
15 1164825
16 4379920
17 16649851
18 58473414

List of values

[1, 1, 2, 3, 7, 13, 35, 85, 254, 701, 2377, 7944, 25220, 95910, 332300, 1164825, 4379920, 16649851, 58473414]

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

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