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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.

A334708 Array read by antidiagonals: T(n,k) (n>=1, k>=1) = number of ways to select four collinear points from an n X k grid.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 1
8 0
9 0
10 1
11 5
12 2
13 0
14 2
15 5
16 15
17 10
18 3
19 3
20 10
21 15
22 35
23 30
24 15
25 10
26 15
27 30
28 35
29 70
30 70
31 45
32 29
33 29
34 45
35 70
36 70
37 126
38 140
39 105
40 72
41 64
42 72
43 105
44 140
45 126
46 210
47 252
48 210
49 157
50 129
51 129
52 157
53 210
54 252
55 210
56 330
57 420
58 378
59 302
60 248
61 234
62 248
63 302
64 378
65 420
66 330

List of values

[0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 5, 2, 0, 2, 5, 15, 10, 3, 3, 10, 15, 35, 30, 15, 10, 15, 30, 35, 70, 70, 45, 29, 29, 45, 70, 70, 126, 140, 105, 72, 64, 72, 105, 140, 126, 210, 252, 210, 157, 129, 129, 157, 210, 252, 210, 330, 420, 378, 302, 248, 234, 248, 302, 378, 420, 330]

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

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