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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.

A272626 Array read by antidiagonals: T(n,k) = number of ways to choose 3 distinct points from an n X k rectangular grid so that they form a right isosceles triangle of nonzero area.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 4
6 0
7 0
8 10
9 10
10 0
11 0
12 16
13 28
14 16
15 0
16 0
17 22
18 50
19 50
20 22
21 0
22 0
23 28
24 74
25 96
26 74
27 28
28 0
29 0
30 34
31 98
32 150
33 150
34 98
35 34
36 0
37 0
38 40
39 122
40 208
41 244
42 208
43 122
44 40
45 0
46 0
47 46
48 146
49 268
50 350
51 350
52 268
53 146
54 46
55 0
56 0
57 52
58 170
59 328
60 464
61 516
62 464
63 328
64 170
65 52
66 0

List of values

[0, 0, 0, 0, 4, 0, 0, 10, 10, 0, 0, 16, 28, 16, 0, 0, 22, 50, 50, 22, 0, 0, 28, 74, 96, 74, 28, 0, 0, 34, 98, 150, 150, 98, 34, 0, 0, 40, 122, 208, 244, 208, 122, 40, 0, 0, 46, 146, 268, 350, 350, 268, 146, 46, 0, 0, 52, 170, 328, 464, 516, 464, 328, 170, 52, 0]

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

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