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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.

A216789 Table read by antidiagonals: T(n,k) is the digital sum of k in base n displayed in decimal.

Table of values

n a(n)
2 0
3 0
4 1
5 0
6 1
7 1
8 0
9 1
10 2
11 2
12 0
13 1
14 2
15 1
16 1
17 0
18 1
19 2
20 3
21 2
22 2
23 0
24 1
25 2
26 3
27 1
28 3
29 2
30 0
31 1
32 2
33 3
34 4
35 2
36 2
37 3
38 0
39 1
40 2
41 3
42 4
43 1
44 3
45 3
46 1
47 0
48 1
49 2
50 3
51 4
52 5
53 2
54 4
55 4
56 2
57 0
58 1
59 2
60 3
61 4
62 5
63 1
64 3
65 2
66 1
67 2
68 0
69 1
70 2
71 3
72 4
73 5
74 6
75 2
76 4
77 3
78 2
79 3

List of values

[0, 0, 1, 0, 1, 1, 0, 1, 2, 2, 0, 1, 2, 1, 1, 0, 1, 2, 3, 2, 2, 0, 1, 2, 3, 1, 3, 2, 0, 1, 2, 3, 4, 2, 2, 3, 0, 1, 2, 3, 4, 1, 3, 3, 1, 0, 1, 2, 3, 4, 5, 2, 4, 4, 2, 0, 1, 2, 3, 4, 5, 1, 3, 2, 1, 2, 0, 1, 2, 3, 4, 5, 6, 2, 4, 3, 2, 3]

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