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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.

A099033 a(n) = Sum_{k=1..n} (-1)^A000120(3*k).

Table of values

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

List of values

[1, 2, 3, 4, 5, 6, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, 13, 14, 15, 16, 17, 18, 17, 18, 19, 20, 19, 18, 17, 18, 17, 18, 19, 20, 21, 22, 23, 24, 23, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 33, 34, 35, 34, 35, 34, 33, 32, 33, 34, 35, 34, 35, 36, 37, 38, 39, 40, 41, 42, 41, 42]

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

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