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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.

A237660 Consider the Collatz trajectory of n; if all terms except n and 1 are even then a(n) = 0, otherwise a(n) is the last odd number before 1.

Table of values

n a(n)
1 0
2 0
3 5
4 0
5 0
6 5
7 5
8 0
9 5
10 5
11 5
12 5
13 5
14 5
15 5
16 0
17 5
18 5
19 5
20 5
21 0
22 5
23 5
24 5
25 5
26 5
27 5
28 5
29 5
30 5
31 5
32 0
33 5
34 5
35 5
36 5
37 5
38 5
39 5
40 5
41 5
42 21
43 5
44 5
45 5
46 5
47 5
48 5
49 5
50 5
51 5
52 5
53 5
54 5
55 5
56 5
57 5
58 5
59 5
60 5
61 5
62 5
63 5
64 0
65 5
66 5
67 5
68 5
69 5
70 5
71 5
72 5
73 5
74 5
75 85
76 5
77 5
78 5
79 5
80 5
81 5
82 5
83 5
84 21
85 0
86 5
87 5
88 5
89 5
90 5
91 5
92 5
93 5
94 5
95 5
96 5
97 5
98 5
99 5
100 5
101 5
102 5
103 5
104 5
105 5
106 5
107 5
108 5
109 5
110 5
111 5
112 5
113 85

List of values

[0, 0, 5, 0, 0, 5, 5, 0, 5, 5, 5, 5, 5, 5, 5, 0, 5, 5, 5, 5, 0, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 0, 5, 5, 5, 5, 5, 5, 5, 5, 5, 21, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 0, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 85, 5, 5, 5, 5, 5, 5, 5, 5, 21, 0, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 85]