cp's OEIS Frontend

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.

A279443 Number of ways to place 9 points on an n X n board 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 0
5 22650
6 4987800
7 240023070
8 5219088000
9 68483325960
10 630486309600
11 4456523194200
12 25647802519680
13 125166919041450
14 533442526857240
15 2029603476250350
16 7011735609715200
17 22291042191643680
18 65914292362262400
19 182880685655641440
20 479548000781222400

List of values

[0, 0, 0, 0, 22650, 4987800, 240023070, 5219088000, 68483325960, 630486309600, 4456523194200, 25647802519680, 125166919041450, 533442526857240, 2029603476250350, 7011735609715200, 22291042191643680, 65914292362262400, 182880685655641440, 479548000781222400]

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

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