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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.

A159913 a(n) = 2^(A000120(n) + 1) - 1, where A000120(n) = number of nonzero bits in n.

Table of values

n a(n)
0 1
1 3
2 3
3 7
4 3
5 7
6 7
7 15
8 3
9 7
10 7
11 15
12 7
13 15
14 15
15 31
16 3
17 7
18 7
19 15
20 7
21 15
22 15
23 31
24 7
25 15
26 15
27 31
28 15
29 31
30 31
31 63
32 3
33 7
34 7
35 15
36 7
37 15
38 15
39 31
40 7
41 15
42 15
43 31
44 15
45 31
46 31
47 63
48 7
49 15
50 15
51 31
52 15
53 31
54 31
55 63
56 15
57 31
58 31
59 63
60 31
61 63
62 63
63 127
64 3
65 7
66 7
67 15
68 7
69 15
70 15
71 31
72 7
73 15
74 15
75 31
76 15
77 31
78 31

List of values

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

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