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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.

A377404 In the binary expansion of n, replace the first, third, fifth, etc. 1's by 0's.

Table of values

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

List of values

[0, 0, 0, 1, 0, 1, 2, 2, 0, 1, 2, 2, 4, 4, 4, 5, 0, 1, 2, 2, 4, 4, 4, 5, 8, 8, 8, 9, 8, 9, 10, 10, 0, 1, 2, 2, 4, 4, 4, 5, 8, 8, 8, 9, 8, 9, 10, 10, 16, 16, 16, 17, 16, 17, 18, 18, 16, 17, 18, 18, 20, 20, 20, 21, 0, 1, 2, 2, 4, 4, 4, 5, 8, 8, 8, 9, 8, 9, 10, 10]

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