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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.

A121260 Beginning with a(1)=0, take a(n) to be the smallest number not equal to the product of two consecutive (not distinct) earlier terms.

Table of values

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

List of values

[0, 0, 1, 1, 2, 2, 3, 3, 5, 5, 7, 7, 8, 8, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 32, 33, 33, 34, 34, 36, 36, 37, 37, 38, 38, 39, 39, 40, 40, 41, 41, 42, 42]

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