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 A323559 #17 Jan 30 2019 05:20:39 %S A323559 1,7,49,337,2323,15805,107737,727619,4921655,33056939,222323989, %T A323559 1487064391,9957971965,66391431607,443085643919,2946553003837, %U A323559 19611967535129,130149475953673 %N A323559 Number of rooted self-avoiding knight's paths of length n on an infinite chessboard with first move specified. %Y A323559 Cf. A001411, A212715, A323131, A272773, A323140, A323560. %K A323559 nonn,walk,more %O A323559 1,2 %A A323559 _Hugo Pfoertner_, Jan 17 2019