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.
Z-_Z^2-_Z^3+_Z^4-x), x, 21): seq(coeff(A,x,i), i=0..20); # _Brian Drake's wiki page.
Z-_Z^2-_Z^3+_Z^4-x), x, 21): seq(coeff(A,x,i), i=0..20); # _Brian Drake has authored 0 sequences.