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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.

A347433 Irregular triangle read by rows: T(n,k) is the difference between the total arch lengths of a semi-meander multiplied by its number of exterior arches and total arch lengths of the semi-meanders with n + 1 top arches generated by the exterior arch splitting algorithm on the given semi-meander.

Table of values

n a(n)
2 4
3 4
4 4
5 10
6 4
7 11
8 4
9 12
10 20
11 4
12 13
13 22
14 4
15 14
16 24
17 34
18 4
19 15
20 26
21 37
22 4
23 16
24 28
25 40
26 52
27 4
28 17
29 30
30 43
31 56
32 4
33 18
34 32
35 46
36 60
37 74
38 4
39 19
40 34
41 49
42 64
43 79
44 4
45 20
46 36
47 52
48 68
49 84
50 100
51 4
52 21
53 38
54 55
55 72
56 89
57 106
58 4
59 22
60 40
61 58
62 76
63 94
64 112
65 130
66 4
67 23
68 42
69 61
70 80
71 99

List of values

[4, 4, 4, 10, 4, 11, 4, 12, 20, 4, 13, 22, 4, 14, 24, 34, 4, 15, 26, 37, 4, 16, 28, 40, 52, 4, 17, 30, 43, 56, 4, 18, 32, 46, 60, 74, 4, 19, 34, 49, 64, 79, 4, 20, 36, 52, 68, 84, 100, 4, 21, 38, 55, 72, 89, 106, 4, 22, 40, 58, 76, 94, 112, 130, 4, 23, 42, 61, 80, 99]

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

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