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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.

A175954 Unlabeled (cyclic) Motzkin numbers: number of ways of drawing any number of nonintersecting chords joining n unlabeled points equally spaced on a circle, up to rotations of the circle.

Table of values

n a(n)
0 1
1 1
2 2
3 2
4 4
5 5
6 12
7 19
8 46
9 95
10 230
11 528
12 1320
13 3219
14 8172
15 20714
16 53478
17 138635
18 363486
19 957858
20 2543476
21 6788019
22 18218772
23 49120019
24 133036406
25 361736109
26 987316658
27 2703991820
28 7429445752
29 20473889133
30 56579632732
31 156766505691

List of values

[1, 1, 2, 2, 4, 5, 12, 19, 46, 95, 230, 528, 1320, 3219, 8172, 20714, 53478, 138635, 363486, 957858, 2543476, 6788019, 18218772, 49120019, 133036406, 361736109, 987316658, 2703991820, 7429445752, 20473889133, 56579632732, 156766505691]

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

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