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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.

A293960 Number A(n,k) of linear chord diagrams having n chords and no chord length larger than k; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 1
8 1
9 0
10 1
11 1
12 3
13 1
14 0
15 1
16 1
17 3
18 5
19 1
20 0
21 1
22 1
23 3
24 15
25 11
26 1
27 0
28 1
29 1
30 3
31 15
32 35
33 21
34 1
35 0
36 1
37 1
38 3
39 15
40 105
41 103
42 43
43 1
44 0
45 1
46 1
47 3
48 15
49 105
50 315
51 343
52 85
53 1
54 0
55 1
56 1
57 3
58 15
59 105
60 945
61 1141
62 979
63 171
64 1
65 0
66 1
67 1
68 3
69 15
70 105
71 945
72 3465
73 4779
74 2915
75 341
76 1
77 0

List of values

[1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 3, 1, 0, 1, 1, 3, 5, 1, 0, 1, 1, 3, 15, 11, 1, 0, 1, 1, 3, 15, 35, 21, 1, 0, 1, 1, 3, 15, 105, 103, 43, 1, 0, 1, 1, 3, 15, 105, 315, 343, 85, 1, 0, 1, 1, 3, 15, 105, 945, 1141, 979, 171, 1, 0, 1, 1, 3, 15, 105, 945, 3465, 4779, 2915, 341, 1, 0]