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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.

A072560 Denominators of w(n) where w(1)=w(2)=w(3)=1, w(n)=(w(n-1)*w(n-2)+(w(n-1)+w(n-2))/3) / w(n-3).

Table of values

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

List of values

[3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3, 1, 1, 1, 3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3, 1, 1, 1, 3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3, 1, 1, 1, 3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3, 1, 1, 1, 3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3, 1, 1, 1, 3, 9, 3, 3, 1, 3, 3, 9, 3, 3, 1, 3, 3, 9, 3]