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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.

A289195 a(n) is the number of odd integers divisible by 5 in ]4*(n-1)^2, 4*n^2[.

Table of values

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

List of values

[0, 0, 2, 2, 2, 4, 4, 6, 6, 6, 8, 8, 10, 10, 10, 12, 12, 14, 14, 14, 16, 16, 18, 18, 18, 20, 20, 22, 22, 22, 24, 24, 26, 26, 26, 28, 28, 30, 30, 30, 32, 32, 34, 34, 34, 36, 36, 38, 38, 38, 40, 40, 42, 42, 42, 44, 44, 46, 46, 46, 48, 48, 50, 50, 50, 52, 52, 54]

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

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