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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.

A143715 Number of subsets {a,b,c} of {1,...,n} such that (a+b)^2+c^2 is a square (where c = max(a,b,c)).

Table of values

n a(n)
1 0
2 0
3 2
4 3
5 3
6 6
7 6
8 10
9 14
10 14
11 14
12 25
13 25
14 25
15 35
16 43
17 43
18 50
19 50
20 67
21 85
22 85
23 85
24 113
25 113
26 113
27 123
28 139
29 139
30 158
31 158
32 173
33 191
34 191
35 197
36 230
37 230
38 230
39 244
40 286
41 286
42 321
43 321
44 337
45 379
46 379
47 379
48 456
49 456
50 456
51 474
52 493
53 493
54 512
55 536
56 589
57 609
58 609
59 609

List of values

[0, 0, 2, 3, 3, 6, 6, 10, 14, 14, 14, 25, 25, 25, 35, 43, 43, 50, 50, 67, 85, 85, 85, 113, 113, 113, 123, 139, 139, 158, 158, 173, 191, 191, 197, 230, 230, 230, 244, 286, 286, 321, 321, 337, 379, 379, 379, 456, 456, 456, 474, 493, 493, 512, 536, 589, 609, 609, 609]

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

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