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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.

A211008 Triangle read by rows: T(n,k) = number of squares and rectangles of area 2^(k-1) after n-th stage in the toothpick structure of A139250, n>=1, k>=1, assuming the toothpicks have length 2.

Table of values

n a(n)
1 0
2 0
3 0
4 2
5 0
6 4
7 0
8 4
9 4
10 4
11 8
12 8
13 2
14 8
15 12
16 4
17 8
18 12
19 4
20 12
21 12
22 4
23 16
24 16
25 4
26 16
27 20
28 4
29 20
30 20
31 4
32 32
33 28
34 4
35 40
36 44
37 8
38 2
39 40
40 52
41 12
42 4
43 40
44 52
45 12
46 4
47 44
48 52
49 12
50 4
51 48
52 56
53 12
54 4
55 48
56 60
57 12
58 4
59 52
60 60
61 12
62 4
63 64
64 68
65 12
66 4
67 72
68 84
69 16
70 4

List of values

[0, 0, 0, 2, 0, 4, 0, 4, 4, 4, 8, 8, 2, 8, 12, 4, 8, 12, 4, 12, 12, 4, 16, 16, 4, 16, 20, 4, 20, 20, 4, 32, 28, 4, 40, 44, 8, 2, 40, 52, 12, 4, 40, 52, 12, 4, 44, 52, 12, 4, 48, 56, 12, 4, 48, 60, 12, 4, 52, 60, 12, 4, 64, 68, 12, 4, 72, 84, 16, 4]

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