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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.

A339217 a(n) = Sum_{k=1..n} floor((2*n-k)/k).

Table of values

n a(n)
0 0
1 1
2 4
3 8
4 12
5 17
6 23
7 27
8 34
9 40
10 46
11 52
12 60
13 65
14 73
15 81
16 87
17 93
18 104
19 108
20 118
21 126
22 132
23 140
24 150
25 157
26 165
27 173
28 183
29 189
30 201
31 205
32 216
33 226
34 232
35 242
36 254
37 258
38 268
39 278
40 288
41 295
42 307
43 313
44 323
45 335
46 343
47 349
48 363
49 369
50 382
51 390
52 398
53 408
54 420
55 428
56 440
57 448
58 456
59 464
60 482

List of values

[0, 1, 4, 8, 12, 17, 23, 27, 34, 40, 46, 52, 60, 65, 73, 81, 87, 93, 104, 108, 118, 126, 132, 140, 150, 157, 165, 173, 183, 189, 201, 205, 216, 226, 232, 242, 254, 258, 268, 278, 288, 295, 307, 313, 323, 335, 343, 349, 363, 369, 382, 390, 398, 408, 420, 428, 440, 448, 456, 464, 482]

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

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