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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.

A378401 Rectangular array read by descending antidiagonals: (row 1) = u, and for n >= 2, (row n) = u-inverse runlength sequence of u, where u = A006338. See Comments.

Table of values

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

List of values

[2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 2, 2, 2, 2, 2, 1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1]

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