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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.

A318122 a(0) = a(1) = 1; a(n) = Sum_{k=0..n-2} gcd(a(k), a(n-k-2)).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 3
5 4
6 5
7 6
8 8
9 8
10 13
11 10
12 16
13 18
14 21
15 20
16 28
17 20
18 30
19 50
20 36
21 26
22 67
23 58
24 48
25 46
26 72
27 64
28 76
29 56
30 93
31 72
32 96
33 96
34 138
35 126
36 112
37 102
38 160
39 114
40 160
41 150
42 144
43 126
44 128
45 118
46 273
47 190
48 252
49 130
50 230
51 180
52 260
53 248
54 312
55 212
56 208
57 320
58 422
59 460
60 296
61 452
62 493
63 260
64 436
65 280

List of values

[1, 1, 1, 2, 3, 4, 5, 6, 8, 8, 13, 10, 16, 18, 21, 20, 28, 20, 30, 50, 36, 26, 67, 58, 48, 46, 72, 64, 76, 56, 93, 72, 96, 96, 138, 126, 112, 102, 160, 114, 160, 150, 144, 126, 128, 118, 273, 190, 252, 130, 230, 180, 260, 248, 312, 212, 208, 320, 422, 460, 296, 452, 493, 260, 436, 280]

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

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