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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.

A322402 Triangle read by rows: The number of chord diagrams with n chords and k topologically connected components, 0 <= k <= n.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 2
6 0
7 4
8 6
9 5
10 0
11 27
12 36
13 28
14 14
15 0
16 248
17 310
18 225
19 120
20 42
21 0
22 2830
23 3396
24 2332
25 1210
26 495
27 132
28 0
29 38232
30 44604
31 29302
32 14560
33 6006
34 2002
35 429
36 0
37 593859
38 678696
39 430200
40 204540
41 81900
42 28392
43 8008
44 1430
45 0
46 10401712
47 11701926
48 7204821
49 3289296
50 1263780
51 431256
52 129948
53 31824
54 4862

List of values

[1, 0, 1, 0, 1, 2, 0, 4, 6, 5, 0, 27, 36, 28, 14, 0, 248, 310, 225, 120, 42, 0, 2830, 3396, 2332, 1210, 495, 132, 0, 38232, 44604, 29302, 14560, 6006, 2002, 429, 0, 593859, 678696, 430200, 204540, 81900, 28392, 8008, 1430, 0, 10401712, 11701926, 7204821, 3289296, 1263780, 431256, 129948, 31824, 4862]

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

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