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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.

A360303 a(n) = Sum_{k=1..floor(sqrt(n))} 2^floor(n/k-k).

Table of values

n a(n)
0 0
1 1
2 2
3 4
4 9
5 17
6 34
7 66
8 132
9 261
10 521
11 1033
12 2066
13 4114
14 8226
15 16420
16 32837
17 65605
18 131209
19 262281
20 524554
21 1048850
22 2097682
23 4194834
24 8389668
25 16778277
26 33556517
27 67110981
28 134221897
29 268439625
30 536879242
31 1073750154
32 2147500178
33 4294983954
34 8589967634
35 17179902228
36 34359804453

List of values

[0, 1, 2, 4, 9, 17, 34, 66, 132, 261, 521, 1033, 2066, 4114, 8226, 16420, 32837, 65605, 131209, 262281, 524554, 1048850, 2097682, 4194834, 8389668, 16778277, 33556517, 67110981, 134221897, 268439625, 536879242, 1073750154, 2147500178, 4294983954, 8589967634, 17179902228, 34359804453]

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

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