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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.

A101402 a(0)=0, a(1)=1; for n>=2, let k = smallest power of 2 that is >= n, then a(n) = a(k/2) + a(n-1-k/2).

Table of values

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

List of values

[0, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 9, 9, 9, 9, 10, 10, 10, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 21, 21, 21, 21, 22, 22, 22, 23, 23, 23, 24, 24, 24, 25, 25, 26, 26, 26, 26, 27, 27, 27]

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