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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.

A279444 Number of ways to place n 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 1
2 6
3 78
4 1428
5 34020
6 1005720
7 35526120
8 1460297160
9 68483325960
10 3608847088560
11 211125189789360
12 13577790144108960
13 952129825291925280
14 72303731169467878080
15 5911241852357814772800
16 517670861532464104264800
17 48347072773751574327304800

List of values

[1, 6, 78, 1428, 34020, 1005720, 35526120, 1460297160, 68483325960, 3608847088560, 211125189789360, 13577790144108960, 952129825291925280, 72303731169467878080, 5911241852357814772800, 517670861532464104264800, 48347072773751574327304800]

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

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