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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.

A130519 a(n) = Sum_{k=0..n} floor(k/4). (Partial sums of A002265.)

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 1
5 2
6 3
7 4
8 6
9 8
10 10
11 12
12 15
13 18
14 21
15 24
16 28
17 32
18 36
19 40
20 45
21 50
22 55
23 60
24 66
25 72
26 78
27 84
28 91
29 98
30 105
31 112
32 120
33 128
34 136
35 144
36 153
37 162
38 171
39 180
40 190
41 200
42 210
43 220
44 231
45 242
46 253
47 264
48 276
49 288
50 300
51 312
52 325
53 338
54 351
55 364
56 378
57 392
58 406
59 420
60 435
61 450

List of values

[0, 0, 0, 0, 1, 2, 3, 4, 6, 8, 10, 12, 15, 18, 21, 24, 28, 32, 36, 40, 45, 50, 55, 60, 66, 72, 78, 84, 91, 98, 105, 112, 120, 128, 136, 144, 153, 162, 171, 180, 190, 200, 210, 220, 231, 242, 253, 264, 276, 288, 300, 312, 325, 338, 351, 364, 378, 392, 406, 420, 435, 450]

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

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