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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.

A279450 Number of nonequivalent 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 2
4 285
5 9110
6 126396
7 1055025
8 6266614
9 29198740
10 113262680
11 380775248
12 1140764611
13 3108667306
14 7824370092
15 18407341855
16 40855872764
17 86201399496
18 173952773328
19 337453762782
20 631982899545
21 1146743732126
22 2022212701212
23 3474824082125
24 5831439251154
25 9576836632860

List of values

[0, 0, 2, 285, 9110, 126396, 1055025, 6266614, 29198740, 113262680, 380775248, 1140764611, 3108667306, 7824370092, 18407341855, 40855872764, 86201399496, 173952773328, 337453762782, 631982899545, 1146743732126, 2022212701212, 3474824082125, 5831439251154, 9576836632860]

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

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