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.
(an+1)^2 = (an+1)(n+1) + (a^2)* sum{n}'s wiki page.
(an+1)^2 = (an+1)(n+1) + (a^2)* sum{n} has authored 0 sequences.