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 A323561 #9 Jan 19 2019 16:29:26 %S A323561 2,14,92,584,3644,22482,137626,837466,5072590,30611376,184171252, %T A323561 1105262004,6618842522,39564403462,236123357538,1407249202976, %U A323561 8376673823516 %N A323561 Number of rooted self-avoiding king's walks of n moves on an infinite chessboard with first move specified. %C A323561 The first move is either (0,0) -> (1,0) or (0,0) -> (1,1). Rotated paths are not counted separately. %Y A323561 Cf. A001411, A212715, A272773, A323131, A323140, A323559, A323562. %K A323561 nonn,walk,more %O A323561 1,1 %A A323561 _Hugo Pfoertner_, Jan 17 2019