A131752 Number of ways of choosing the largest subset of {1,2,...,n} such that no two distinct elements differ by a perfect square.
1, 2, 4, 7, 10, 16, 24, 36, 56, 76, 112, 160
Offset: 1
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.