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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.

A060318 Powers of 3 in the odd Catalan numbers Catalan(2^n - 1).

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 0
6 1
7 3
8 0
9 3
10 3
11 3
12 6
13 2
14 2
15 9
16 5
17 5
18 4
19 8
20 5
21 9
22 10
23 5
24 4
25 4
26 4
27 9
28 9
29 8
30 11
31 13
32 13
33 10
34 11
35 10
36 8
37 6
38 12
39 13
40 14
41 13
42 11
43 14
44 15
45 16
46 13
47 11
48 10
49 12
50 18
51 20
52 19
53 20
54 11
55 13
56 19
57 22
58 18
59 15
60 26
61 20
62 17
63 17
64 26
65 21
66 22
67 18
68 18
69 23
70 26
71 20
72 19
73 23
74 21
75 22
76 19
77 27
78 17
79 35

List of values

[0, 0, 1, 2, 0, 1, 3, 0, 3, 3, 3, 6, 2, 2, 9, 5, 5, 4, 8, 5, 9, 10, 5, 4, 4, 4, 9, 9, 8, 11, 13, 13, 10, 11, 10, 8, 6, 12, 13, 14, 13, 11, 14, 15, 16, 13, 11, 10, 12, 18, 20, 19, 20, 11, 13, 19, 22, 18, 15, 26, 20, 17, 17, 26, 21, 22, 18, 18, 23, 26, 20, 19, 23, 21, 22, 19, 27, 17, 35]

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