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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.

A279441 Number of ways to place 7 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
4 816
5 93000
6 2602800
7 35526120
8 309328320
9 1972234656
10 9989784000
11 42369069600
12 155993500080
13 511660972680
14 1524225598896
15 4185197289000
16 10715254368000
17 25817751281280
18 58981960615680
19 128554066935936
20 268691201838000
21 540886175310600
22 1052558059827120

List of values

[0, 0, 0, 816, 93000, 2602800, 35526120, 309328320, 1972234656, 9989784000, 42369069600, 155993500080, 511660972680, 1524225598896, 4185197289000, 10715254368000, 25817751281280, 58981960615680, 128554066935936, 268691201838000, 540886175310600, 1052558059827120]

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

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