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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.

A065423 Number of ordered length 2 compositions of n with at least one even summand.

Table of values

n a(n)
1 0
2 0
3 2
4 1
5 4
6 2
7 6
8 3
9 8
10 4
11 10
12 5
13 12
14 6
15 14
16 7
17 16
18 8
19 18
20 9
21 20
22 10
23 22
24 11
25 24
26 12
27 26
28 13
29 28
30 14
31 30
32 15
33 32
34 16
35 34
36 17
37 36
38 18
39 38
40 19
41 40
42 20
43 42
44 21
45 44
46 22
47 46
48 23
49 48
50 24
51 50
52 25
53 52
54 26
55 54
56 27
57 56
58 28
59 58
60 29
61 60
62 30
63 62
64 31
65 64
66 32
67 66
68 33
69 68
70 34
71 70
72 35
73 72
74 36
75 74

List of values

[0, 0, 2, 1, 4, 2, 6, 3, 8, 4, 10, 5, 12, 6, 14, 7, 16, 8, 18, 9, 20, 10, 22, 11, 24, 12, 26, 13, 28, 14, 30, 15, 32, 16, 34, 17, 36, 18, 38, 19, 40, 20, 42, 21, 44, 22, 46, 23, 48, 24, 50, 25, 52, 26, 54, 27, 56, 28, 58, 29, 60, 30, 62, 31, 64, 32, 66, 33, 68, 34, 70, 35, 72, 36, 74]

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