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.
(i,j) <> 0}, i, j in {1,2,3,4}. Moreover, the entry in row 1 and column j of [A's wiki page.
(i,j) <> 0}, i, j in {1,2,3,4}. Moreover, the entry in row 1 and column j of [A has authored 0 sequences.