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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.

A336257 a(n) = Catalan(n) mod (2*n+1).

Table of values

n a(n)
0 0
1 1
2 2
3 5
4 5
5 9
6 2
7 9
8 2
9 17
10 17
11 21
12 12
13 22
14 2
15 29
16 18
17 30
18 2
19 30
20 2
21 41
22 30
23 45
24 9
25 21
26 2
27 54
28 53
29 57
30 2
31 28
32 38
33 65
34 42
35 69
36 2
37 64
38 70
39 77
40 5
41 81
42 80
43 33
44 2
45 14
46 27
47 45
48 2
49 36
50 2
51 101
52 87
53 105
54 2
55 78
56 2
57 34
58 75
59 6
60 101
61 45
62 62
63 125
64 39
65 129
66 74
67 60
68 2
69 137
70 90

List of values

[0, 1, 2, 5, 5, 9, 2, 9, 2, 17, 17, 21, 12, 22, 2, 29, 18, 30, 2, 30, 2, 41, 30, 45, 9, 21, 2, 54, 53, 57, 2, 28, 38, 65, 42, 69, 2, 64, 70, 77, 5, 81, 80, 33, 2, 14, 27, 45, 2, 36, 2, 101, 87, 105, 2, 78, 2, 34, 75, 6, 101, 45, 62, 125, 39, 129, 74, 60, 2, 137, 90]

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

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