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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.

A279451 Number of nonequivalent 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
4 115
5 11810
6 326190
7 4444935
8 38675954
9 246563232
10 1248782460
11 5296300670
12 19499431941
13 63958228738
14 190528987506
15 523151460045
16 1339408935540
17 3227223506896
18 7372750196952
19 16069268866908
20 33586411339335
21 67610793877650
22 131569779776182
23 248290280743571

List of values

[0, 0, 0, 115, 11810, 326190, 4444935, 38675954, 246563232, 1248782460, 5296300670, 19499431941, 63958228738, 190528987506, 523151460045, 1339408935540, 3227223506896, 7372750196952, 16069268866908, 33586411339335, 67610793877650, 131569779776182, 248290280743571]

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

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