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.
(n-m)(m), n >= 1, m = 1, 2, ..., n, with sigma^*'s wiki page.
(n-m)(m), n >= 1, m = 1, 2, ..., n, with sigma^* has authored 0 sequences.