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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.

A319840 Table read by antidiagonals: T(n, k) is the number of elements on the perimeter of an n X k matrix.

Table of values

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

List of values

[1, 2, 2, 3, 4, 3, 4, 6, 6, 4, 5, 8, 8, 8, 5, 6, 10, 10, 10, 10, 6, 7, 12, 12, 12, 12, 12, 7, 8, 14, 14, 14, 14, 14, 14, 8, 9, 16, 16, 16, 16, 16, 16, 16, 9, 10, 18, 18, 18, 18, 18, 18, 18, 18, 10, 11, 20, 20, 20, 20, 20, 20, 20, 20, 20, 11, 12, 22, 22, 22]

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

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