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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.

A279442 Number of ways to place 8 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 0
4 90
5 67950
6 4531950
7 109425330
8 1460297160
9 13112872920
10 88456195800
11 480149029800
12 2196080372970
13 8743233946590
14 31033043111070
15 99992483914050
16 296626638016800
17 819218054279520
18 2125440234303840
19 5218743585428640
20 12201529135725450
21 27304286810701950

List of values

[0, 0, 0, 90, 67950, 4531950, 109425330, 1460297160, 13112872920, 88456195800, 480149029800, 2196080372970, 8743233946590, 31033043111070, 99992483914050, 296626638016800, 819218054279520, 2125440234303840, 5218743585428640, 12201529135725450, 27304286810701950]

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

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