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.
?EvenQ,crb[n-1]+crb[n-2],'s wiki page.
?EvenQ,crb[n-1]+crb[n-2], has authored 0 sequences.