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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.

A099034 a(n) = Sum_{k=1..n} (-1)^A000120(5*k).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 3
6 4
7 3
8 4
9 5
10 4
11 3
12 4
13 5
14 4
15 5
16 6
17 7
18 8
19 9
20 8
21 9
22 8
23 7
24 8
25 9
26 10
27 11
28 10
29 9
30 10
31 9
32 10
33 11
34 12
35 13
36 14
37 13
38 14
39 15
40 14
41 13
42 14
43 15
44 14
45 15
46 14
47 15
48 16
49 17
50 18
51 19
52 20
53 19
54 20
55 21
56 20
57 19
58 18
59 17
60 18
61 19
62 18
63 19
64 20
65 21
66 22
67 23
68 24
69 23
70 24
71 23
72 24
73 25
74 24
75 23

List of values

[1, 2, 3, 4, 3, 4, 3, 4, 5, 4, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 8, 7, 8, 9, 10, 11, 10, 9, 10, 9, 10, 11, 12, 13, 14, 13, 14, 15, 14, 13, 14, 15, 14, 15, 14, 15, 16, 17, 18, 19, 20, 19, 20, 21, 20, 19, 18, 17, 18, 19, 18, 19, 20, 21, 22, 23, 24, 23, 24, 23, 24, 25, 24, 23]

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