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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.

A143445 Triangle read by rows, A051731 * (A001318 * 0^(n-k)); 1<=k<=n.

Table of values

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

List of values

[1, 1, 2, 1, 0, 5, 1, 2, 0, 7, 1, 0, 0, 0, 12, 1, 2, 5, 0, 0, 15, 1, 0, 0, 0, 0, 0, 22, 1, 2, 0, 7, 0, 0, 0, 26, 1, 0, 5, 0, 0, 0, 0, 0, 35, 1, 2, 0, 0, 12, 0, 0, 0, 0, 40, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 51, 1, 2, 5, 7, 0, 15, 0, 0, 0, 0, 0, 57]

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