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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.

A279440 Number of ways to place 6 points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

Table of values

n a(n)
1 0
2 0
3 6
4 2040
5 71400
6 1005720
7 8421630
8 50092896
9 233483040
10 905925600
11 3045791430
12 9125544120
13 24868110696
14 62593429080
15 147255640350
16 326843422080
17 689604309120
18 1391614736256
19 2699616160710
20 5055848825400
21 9173923662120
22 16177675640280
23 27798546316926
24 46651469520480

List of values

[0, 0, 6, 2040, 71400, 1005720, 8421630, 50092896, 233483040, 905925600, 3045791430, 9125544120, 24868110696, 62593429080, 147255640350, 326843422080, 689604309120, 1391614736256, 2699616160710, 5055848825400, 9173923662120, 16177675640280, 27798546316926, 46651469520480]

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

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