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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.

A177720 Number of line segments connecting exactly 4 points in an n x n grid of points.

Table of values

n a(n)
1 0
2 0
3 0
4 10
5 28
6 54
7 104
8 170
9 252
10 394
11 568
12 774
13 1068
14 1410
15 1800
16 2374
17 3028
18 3762
19 4656
20 5646
21 6732
22 8190
23 9792
24 11538
25 13636
26 15910
27 18360
28 21334
29 24532
30 27954
31 31856
32 36014
33 40428
34 45798
35 51504
36 57546
37 64228
38 71278
39 78696
40 87466
41 96700

List of values

[0, 0, 0, 10, 28, 54, 104, 170, 252, 394, 568, 774, 1068, 1410, 1800, 2374, 3028, 3762, 4656, 5646, 6732, 8190, 9792, 11538, 13636, 15910, 18360, 21334, 24532, 27954, 31856, 36014, 40428, 45798, 51504, 57546, 64228, 71278, 78696, 87466, 96700]

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

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