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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.

A054499 Number of pairings on a bracelet; number of chord diagrams that can be turned over and having n chords.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 17
5 79
6 554
7 5283
8 65346
9 966156
10 16411700
11 312700297
12 6589356711
13 152041845075
14 3811786161002
15 103171594789775
16 2998419746654530
17 93127358763431113
18 3078376375601255821
19 107905191542909828013
20 3997887336845307589431

List of values

[1, 1, 2, 5, 17, 79, 554, 5283, 65346, 966156, 16411700, 312700297, 6589356711, 152041845075, 3811786161002, 103171594789775, 2998419746654530, 93127358763431113, 3078376375601255821, 107905191542909828013, 3997887336845307589431]

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

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