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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.

A160125 Number of squares and rectangles that are created at the n-th stage in the toothpick structure (see A139250).

Table of values

n a(n)
1 0
2 0
3 2
4 2
5 0
6 4
7 10
8 6
9 0
10 4
11 8
12 4
13 4
14 20
15 30
16 14
17 0
18 4
19 8
20 4
21 4
22 20
23 28
24 12
25 4
26 16
27 20
28 12
29 28
30 72
31 78
32 30
33 0
34 4
35 8
36 4
37 4
38 20
39 28
40 12
41 4
42 16
43 20
44 12
45 28
46 72
47 76
48 28
49 4
50 16
51 20
52 12
53 28
54 68
55 68
56 28
57 24
58 52
59 52
60 52
61 128
62 224
63 190
64 62
65 0
66 4
67 8
68 4
69 4
70 20
71 28
72 12
73 4
74 16
75 20
76 12
77 28
78 72

List of values

[0, 0, 2, 2, 0, 4, 10, 6, 0, 4, 8, 4, 4, 20, 30, 14, 0, 4, 8, 4, 4, 20, 28, 12, 4, 16, 20, 12, 28, 72, 78, 30, 0, 4, 8, 4, 4, 20, 28, 12, 4, 16, 20, 12, 28, 72, 76, 28, 4, 16, 20, 12, 28, 68, 68, 28, 24, 52, 52, 52, 128, 224, 190, 62, 0, 4, 8, 4, 4, 20, 28, 12, 4, 16, 20, 12, 28, 72]

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