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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.

A307120 a(1) = 3, for n>1, a(n) = A000005(n-1) + A000005(n) + A000005(n+1).

Table of values

n a(n)
1 3
2 5
3 7
4 7
5 9
6 8
7 10
8 9
9 11
10 9
11 12
12 10
13 12
14 10
15 13
16 11
17 13
18 10
19 14
20 12
21 14
22 10
23 14
24 13
25 15
26 11
27 14
28 12
29 16
30 12
31 16
32 12
33 14
34 12
35 17
36 15
37 15
38 10
39 16
40 14
41 18
42 12
43 16
44 14
45 16
46 12
47 16
48 15
49 19
50 13
51 16
52 12
53 16
54 14
55 20
56 16
57 16
58 10
59 18
60 16
61 18
62 12
63 17
64 17
65 19
66 14
67 16
68 12
69 18
70 14
71 22
72 16
73 18
74 12
75 16
76 16
77 18
78 14
79 20

List of values

[3, 5, 7, 7, 9, 8, 10, 9, 11, 9, 12, 10, 12, 10, 13, 11, 13, 10, 14, 12, 14, 10, 14, 13, 15, 11, 14, 12, 16, 12, 16, 12, 14, 12, 17, 15, 15, 10, 16, 14, 18, 12, 16, 14, 16, 12, 16, 15, 19, 13, 16, 12, 16, 14, 20, 16, 16, 10, 18, 16, 18, 12, 17, 17, 19, 14, 16, 12, 18, 14, 22, 16, 18, 12, 16, 16, 18, 14, 20]

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