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.
(1,k), that is, the n-th row of the triangle is given by the first row of M_n. - _L. Edson Jeffery has authored 0 sequences.