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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.

A159937 Triangle read by rows, A054525 * A127478, as infinite lower triangular matrices.

Table of values

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

List of values

[1, 1, 1, 2, 0, 2, 2, 1, 0, 2, 4, 0, 0, 0, 4, 2, 2, 2, 0, 0, 2, 6, 0, 0, 0, 0, 0, 6, 4, 2, 0, 2, 0, 0, 0, 4, 6, 0, 4, 0, 0, 0, 0, 0, 6, 4, 4, 0, 0, 4, 0, 0, 0, 0, 4, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 4, 2, 4, 4, 0, 2, 0, 0, 0, 0, 0, 4]

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