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 A336724 #11 Aug 03 2020 03:42:59 %S A336724 1,3,7,17,37,83,181,399,863,1887,4057,8797,18851,40649,86911,186705, %T A336724 398413,853407,1818099,3885377,8266359,17632961,37473467,79814011, %U A336724 169457991,360469139,764700473,1624915019,3444615545,7312733017,15492242679,32862908109,69581860921,147497088201 %N A336724 Number of n-step self-avoiding walks on the half-Manhattan square lattice. %C A336724 In the half-Manhattan lattice, E-W streets run alternately E and W, but N-S streets are two way. %H A336724 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a336/A336724.java">Java program</a> (github) %Y A336724 Cf. A336705 (coordination sequence), A336742 (self-avoiding cycles), A117633 (Manhattan lattice), A001411 (square lattice), A322419 (L-lattice). %K A336724 nonn,walk %O A336724 0,2 %A A336724 _Sean A. Irvine_, Aug 01 2020