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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.

A130481 a(n) = Sum_{k=0..n} (k mod 3) (i.e., partial sums of A010872).

Table of values

n a(n)
0 0
1 1
2 3
3 3
4 4
5 6
6 6
7 7
8 9
9 9
10 10
11 12
12 12
13 13
14 15
15 15
16 16
17 18
18 18
19 19
20 21
21 21
22 22
23 24
24 24
25 25
26 27
27 27
28 28
29 30
30 30
31 31
32 33
33 33
34 34
35 36
36 36
37 37
38 39
39 39
40 40
41 42
42 42
43 43
44 45
45 45
46 46
47 48
48 48
49 49
50 51
51 51
52 52
53 54
54 54
55 55
56 57
57 57
58 58
59 60
60 60
61 61
62 63
63 63
64 64
65 66
66 66
67 67
68 69
69 69
70 70
71 72
72 72

List of values

[0, 1, 3, 3, 4, 6, 6, 7, 9, 9, 10, 12, 12, 13, 15, 15, 16, 18, 18, 19, 21, 21, 22, 24, 24, 25, 27, 27, 28, 30, 30, 31, 33, 33, 34, 36, 36, 37, 39, 39, 40, 42, 42, 43, 45, 45, 46, 48, 48, 49, 51, 51, 52, 54, 54, 55, 57, 57, 58, 60, 60, 61, 63, 63, 64, 66, 66, 67, 69, 69, 70, 72, 72]

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

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