cp's OEIS Frontend

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.

A306898 a(n) = Sum_{d|n} 2^d*phi(2*n/d).

Table of values

n a(n)
1 2
2 8
3 12
4 32
5 40
6 96
7 140
8 320
9 540
10 1120
11 2068
12 4320
13 8216
14 16688
15 32880
16 66176
17 131104
18 263376
19 524324
20 1050880
21 2097480
22 4198480
23 8388652
24 16786368
25 33554600
26 67125344
27 134218836
28 268468928
29 536870968
30 1073809920
31 2147483708
32 4295099648
33 8589938808
34 17180131456
35 34359739120
36 68720011776

List of values

[2, 8, 12, 32, 40, 96, 140, 320, 540, 1120, 2068, 4320, 8216, 16688, 32880, 66176, 131104, 263376, 524324, 1050880, 2097480, 4198480, 8388652, 16786368, 33554600, 67125344, 134218836, 268468928, 536870968, 1073809920, 2147483708, 4295099648, 8589938808, 17180131456, 34359739120, 68720011776]