cp's OEIS Frontend

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.

A211511 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2=2x*y.

Table of values

n a(n)
0 0
1 0
2 2
3 2
4 4
5 4
6 6
7 6
8 10
9 12
10 14
11 14
12 18
13 18
14 20
15 20
16 24
17 24
18 30
19 30
20 32
21 32
22 34
23 34
24 40
25 44
26 46
27 48
28 50
29 50
30 54
31 54
32 62
33 62
34 64
35 64
36 72
37 72
38 74
39 74
40 80
41 80
42 82
43 82
44 84
45 86
46 88
47 88
48 94
49 100
50 110
51 110
52 112
53 112
54 118
55 118
56 124
57 124
58 126
59 126
60 132
61 132
62 134
63 136

List of values

[0, 0, 2, 2, 4, 4, 6, 6, 10, 12, 14, 14, 18, 18, 20, 20, 24, 24, 30, 30, 32, 32, 34, 34, 40, 44, 46, 48, 50, 50, 54, 54, 62, 62, 64, 64, 72, 72, 74, 74, 80, 80, 82, 82, 84, 86, 88, 88, 94, 100, 110, 110, 112, 112, 118, 118, 124, 124, 126, 126, 132, 132, 134, 136]

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

Content is available under The OEIS End-User License Agreement.