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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.

A034738 Dirichlet convolution of b_n = 2^(n-1) with phi(n).

Table of values

n a(n)
1 1
2 3
3 6
4 12
5 20
6 42
7 70
8 144
9 270
10 540
11 1034
12 2112
13 4108
14 8274
15 16440
16 32928
17 65552
18 131418
19 262162
20 524880
21 1048740
22 2098206
23 4194326
24 8391024
25 16777300
26 33558564
27 67109418
28 134226120
29 268435484
30 536888520
31 1073741854
32 2147516736

List of values

[1, 3, 6, 12, 20, 42, 70, 144, 270, 540, 1034, 2112, 4108, 8274, 16440, 32928, 65552, 131418, 262162, 524880, 1048740, 2098206, 4194326, 8391024, 16777300, 33558564, 67109418, 134226120, 268435484, 536888520, 1073741854, 2147516736]

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

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