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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.

A327481 Triangle read by rows where T(n,k) is the number of nonempty subsets of {1..n} with mean k.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 1
7 1
8 3
9 3
10 1
11 1
12 3
13 7
14 3
15 1
16 1
17 3
18 9
19 9
20 3
21 1
22 1
23 3
24 9
25 19
26 9
27 3
28 1
29 1
30 3
31 9
32 25
33 25
34 9
35 3
36 1
37 1
38 3
39 9
40 29
41 51
42 29
43 9
44 3
45 1
46 1
47 3
48 9
49 31
50 75
51 75
52 31
53 9
54 3
55 1
56 1
57 3
58 9
59 31
60 93
61 151
62 93
63 31
64 9
65 3
66 1
67 1
68 3
69 9
70 31
71 105
72 235
73 235
74 105
75 31
76 9
77 3
78 1

List of values

[1, 1, 1, 1, 3, 1, 1, 3, 3, 1, 1, 3, 7, 3, 1, 1, 3, 9, 9, 3, 1, 1, 3, 9, 19, 9, 3, 1, 1, 3, 9, 25, 25, 9, 3, 1, 1, 3, 9, 29, 51, 29, 9, 3, 1, 1, 3, 9, 31, 75, 75, 31, 9, 3, 1, 1, 3, 9, 31, 93, 151, 93, 31, 9, 3, 1, 1, 3, 9, 31, 105, 235, 235, 105, 31, 9, 3, 1]