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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.

A279211 Fill an array by antidiagonals upwards; in the n-th cell, enter the number of earlier cells that can be seen from that cell.

Table of values

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

List of values

[0, 1, 2, 2, 4, 4, 3, 5, 6, 6, 4, 6, 8, 8, 8, 5, 7, 9, 10, 10, 10, 6, 8, 10, 12, 12, 12, 12, 7, 9, 11, 13, 14, 14, 14, 14, 8, 10, 12, 14, 16, 16, 16, 16, 16, 9, 11, 13, 15, 17, 18, 18, 18, 18, 18, 10, 12, 14, 16, 18, 20, 20, 20, 20, 20, 20, 11, 13, 15, 17]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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