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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.

A324641 Sum of the Doudna sequence and its Dirichlet inverse: a(n) = A005940(n) + A324640(n).

Table of values

n a(n)
1 2
2 0
3 0
4 4
5 0
6 12
7 0
8 8
9 9
10 20
11 0
12 12
13 0
14 36
15 30
16 16
17 0
18 10
19 0
20 20
21 54
22 60
23 0
24 24
25 25
26 100
27 15
28 36
29 0
30 48
31 0
32 32
33 90
34 44
35 90
36 28
37 0
38 84
39 150
40 40
41 0
42 32
43 0
44 60
45 97
46 180
47 0
48 48
49 81
50 146
51 66
52 100
53 0
54 270
55 150
56 72
57 126
58 500
59 0
60 108
61 0
62 324
63 93
64 64
65 250
66 -128
67 0
68 44
69 270
70 -48
71 0
72 56
73 0
74 220
75 339
76 84
77 270
78 -48
79 0
80 80
81 391
82 308
83 0
84 140
85 110

List of values

[2, 0, 0, 4, 0, 12, 0, 8, 9, 20, 0, 12, 0, 36, 30, 16, 0, 10, 0, 20, 54, 60, 0, 24, 25, 100, 15, 36, 0, 48, 0, 32, 90, 44, 90, 28, 0, 84, 150, 40, 0, 32, 0, 60, 97, 180, 0, 48, 81, 146, 66, 100, 0, 270, 150, 72, 126, 500, 0, 108, 0, 324, 93, 64, 250, -128, 0, 44, 270, -48, 0, 56, 0, 220, 339, 84, 270, -48, 0, 80, 391, 308, 0, 140, 110]

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