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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.

A227133 Given a square grid with side n consisting of n^2 cells (or points), a(n) is the maximum number of points that can be painted so that no four of the painted ones form a square with sides parallel to the grid.

Table of values

n a(n)
1 1
2 3
3 7
4 12
5 17
6 24
7 32
8 41
9 51
10 61
11 73
12 85
13 98

List of values

[1, 3, 7, 12, 17, 24, 32, 41, 51, 61, 73, 85, 98]

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

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