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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.

A031266 a(n)=(# 1's)-(# 2's) in first n terms of A031253.

Table of values

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

List of values

[1, 1, 2, 2, 3, 2, 3, 3, 2, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 3, 4, 4, 4, 5, 6, 7, 8, 9, 9, 10, 9, 9, 10, 9, 8, 9, 8, 8, 9, 9, 10, 11, 11, 11, 12, 12, 12, 13, 13, 12, 13, 13, 13, 12, 12, 13, 12, 12, 12, 11, 12, 12, 11, 12, 11, 10, 11, 11]

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