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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.

A151920 a(n) = (Sum_{i=1..n+1} 3^wt(i))/3, where wt() = A000120().

Table of values

n a(n)
0 1
1 2
2 5
3 6
4 9
5 12
6 21
7 22
8 25
9 28
10 37
11 40
12 49
13 58
14 85
15 86
16 89
17 92
18 101
19 104
20 113
21 122
22 149
23 152
24 161
25 170
26 197
27 206
28 233
29 260
30 341
31 342
32 345
33 348
34 357
35 360
36 369
37 378
38 405
39 408
40 417
41 426
42 453
43 462
44 489
45 516
46 597
47 600
48 609
49 618
50 645
51 654
52 681
53 708
54 789
55 798
56 825
57 852
58 933
59 960

List of values

[1, 2, 5, 6, 9, 12, 21, 22, 25, 28, 37, 40, 49, 58, 85, 86, 89, 92, 101, 104, 113, 122, 149, 152, 161, 170, 197, 206, 233, 260, 341, 342, 345, 348, 357, 360, 369, 378, 405, 408, 417, 426, 453, 462, 489, 516, 597, 600, 609, 618, 645, 654, 681, 708, 789, 798, 825, 852, 933, 960]

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

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