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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.

A290886 Let S be the sequence generated by these rules: 0 is in S, and if z is in S, then z * (1+i) and (z-1) * (1+i) + 1 are in S (where i denotes the imaginary unit), and duplicates are deleted as they occur; a(n) = the square of the norm of the n-th term of S.

Table of values

n a(n)
1 0
2 1
3 2
4 5
5 4
6 5
7 10
8 13
9 8
10 5
11 10
12 9
13 20
14 17
15 26
16 25
17 16
18 9
19 10
20 5
21 20
22 13
23 18
24 13
25 40
26 29
27 34
28 25
29 52
30 41
31 50
32 41
33 32
34 25
35 18
36 13
37 20
38 13
39 10
40 5
41 40
42 29
43 26
44 17
45 36
46 25
47 26
48 17
49 80
50 65
51 58
52 45
53 68
54 53
55 50
56 37
57 104
58 85
59 82
60 65
61 100
62 81
63 82
64 65
65 64
66 65
67 50
68 53

List of values

[0, 1, 2, 5, 4, 5, 10, 13, 8, 5, 10, 9, 20, 17, 26, 25, 16, 9, 10, 5, 20, 13, 18, 13, 40, 29, 34, 25, 52, 41, 50, 41, 32, 25, 18, 13, 20, 13, 10, 5, 40, 29, 26, 17, 36, 25, 26, 17, 80, 65, 58, 45, 68, 53, 50, 37, 104, 85, 82, 65, 100, 81, 82, 65, 64, 65, 50, 53]

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