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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.

A317531 Expansion of Sum_{p prime, k>=1} x^(p^k)/(1 + x^(p^k)).

Table of values

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

List of values

[0, 1, 1, 0, 1, 0, 1, -1, 2, 0, 1, -1, 1, 0, 2, -2, 1, -1, 1, -1, 2, 0, 1, -2, 2, 0, 3, -1, 1, -1, 1, -3, 2, 0, 2, -2, 1, 0, 2, -2, 1, -1, 1, -1, 3, 0, 1, -3, 2, -1, 2, -1, 1, -2, 2, -2, 2, 0, 1, -2, 1, 0, 3, -4, 2, -1, 1, -1, 2, -1, 1, -3, 1, 0, 3, -1, 2, -1, 1, -3, 4, 0, 1, -2, 2, 0, 2, -2, 1, -2, 2, -1, 2, 0, 2]