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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.

A074330 a(n) = Sum_{k=1..n} 2^b(k) where b(k) denotes the number of 1's in the binary representation of k.

Table of values

n a(n)
1 2
2 4
3 8
4 10
5 14
6 18
7 26
8 28
9 32
10 36
11 44
12 48
13 56
14 64
15 80
16 82
17 86
18 90
19 98
20 102
21 110
22 118
23 134
24 138
25 146
26 154
27 170
28 178
29 194
30 210
31 242
32 244
33 248
34 252
35 260
36 264
37 272
38 280
39 296
40 300
41 308
42 316
43 332
44 340
45 356
46 372
47 404
48 408
49 416
50 424
51 440
52 448
53 464
54 480
55 512
56 520
57 536

List of values

[2, 4, 8, 10, 14, 18, 26, 28, 32, 36, 44, 48, 56, 64, 80, 82, 86, 90, 98, 102, 110, 118, 134, 138, 146, 154, 170, 178, 194, 210, 242, 244, 248, 252, 260, 264, 272, 280, 296, 300, 308, 316, 332, 340, 356, 372, 404, 408, 416, 424, 440, 448, 464, 480, 512, 520, 536]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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