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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.

A174203 In the sequence A007088 of binary representations of n, delete the 1st, 3rd, 5th, 7th, 9th etc occurrence of 0 and 1. Rewrite the bits left over in base 10.

Table of values

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

List of values

[2, 1, 0, 1, 2, 3, 0, 2, 2, 5, 2, 1, 6, 3, 0, 2, 4, 5, 2, 1, 5, 3, 2, 2, 5, 5, 2, 3, 6, 7, 0, 4, 4, 9, 2, 1, 10, 3, 4, 2, 10, 5, 2, 5, 5, 11, 4, 2, 10, 5, 2, 5, 5, 11, 2, 6, 6, 13, 6, 3, 14, 7, 0, 4, 8, 9, 2, 1, 9, 3, 2, 2, 9, 5, 2, 5, 10, 11, 4]

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