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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.

A135540 a(n) = 2^(A000523(n) - A000120(n) + 2) - 1.

Table of values

n a(n)
1 1
2 3
3 1
4 7
5 3
6 3
7 1
8 15
9 7
10 7
11 3
12 7
13 3
14 3
15 1
16 31
17 15
18 15
19 7
20 15
21 7
22 7
23 3
24 15
25 7
26 7
27 3
28 7
29 3
30 3
31 1
32 63
33 31
34 31
35 15
36 31
37 15
38 15
39 7
40 31
41 15
42 15
43 7
44 15
45 7
46 7
47 3
48 31
49 15
50 15
51 7
52 15
53 7
54 7
55 3
56 15
57 7
58 7
59 3
60 7
61 3
62 3
63 1
64 127
65 63
66 63
67 31
68 63
69 31
70 31
71 15
72 63
73 31
74 31
75 15
76 31
77 15
78 15
79 7
80 63
81 31
82 31
83 15
84 31
85 15

List of values

[1, 3, 1, 7, 3, 3, 1, 15, 7, 7, 3, 7, 3, 3, 1, 31, 15, 15, 7, 15, 7, 7, 3, 15, 7, 7, 3, 7, 3, 3, 1, 63, 31, 31, 15, 31, 15, 15, 7, 31, 15, 15, 7, 15, 7, 7, 3, 31, 15, 15, 7, 15, 7, 7, 3, 15, 7, 7, 3, 7, 3, 3, 1, 127, 63, 63, 31, 63, 31, 31, 15, 63, 31, 31, 15, 31, 15, 15, 7, 63, 31, 31, 15, 31, 15]

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